treewide: don't use single quotes with placeholder

27 files changed, 32 insertions, 32 deletions

diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/a11y/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/a11y/default.nix
index 3b85b123fd03..7a79f72f1a2e 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/a11y/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/a11y/default.nix
@@ -51,7 +51,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Universal Access Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/about/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/about/default.nix
index bd6df460c04b..3247aed4993e 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/about/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/about/default.nix
@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
     ./remove-update-button.patch
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard About Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/applications/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/applications/default.nix
index dca9cc662a2b..ddb589c9e792 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/applications/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/applications/default.nix
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Applications Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/bluetooth/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/bluetooth/default.nix
index d1663ad48cd3..9f1c75b7b438 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/bluetooth/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/bluetooth/default.nix
@@ -44,7 +44,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Bluetooth Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/datetime/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/datetime/default.nix
index fb7ea18e88be..c0c7bbdec2e5 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/datetime/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/datetime/default.nix
@@ -55,7 +55,7 @@ stdenv.mkDerivation rec {
     ./clock-format.patch
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Date & Time Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/display/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/display/default.nix
index c15abfd8cb81..76cfe61fc777 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/display/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/display/default.nix
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Displays Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/keyboard/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/keyboard/default.nix
index ba753af7e202..8b82543a0e5f 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/keyboard/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/keyboard/default.nix
@@ -57,7 +57,7 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Keyboard Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/mouse-touchpad/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/mouse-touchpad/default.nix
index 00579c545254..7e572e2326bd 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/mouse-touchpad/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/mouse-touchpad/default.nix
@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Mouse & Touchpad Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/network/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/network/default.nix
index 09d6da4f2460..b3e4879fdae4 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/network/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/network/default.nix
@@ -55,7 +55,7 @@ stdenv.mkDerivation rec {
   ];
 
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Networking Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/notifications/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/notifications/default.nix
index e547f22fec16..a61124954698 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/notifications/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/notifications/default.nix
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Notifications Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/pantheon-shell/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/pantheon-shell/default.nix
index b9fad17c2f75..6046a4d21252 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/pantheon-shell/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/pantheon-shell/default.nix
@@ -57,7 +57,7 @@ stdenv.mkDerivation rec {
   '';
 
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Desktop Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/power/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/power/default.nix
index 461ddcd3764a..ea197643b95c 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/power/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/power/default.nix
@@ -64,10 +64,10 @@ stdenv.mkDerivation rec {
       --subst-var-by GSD_GSETTINGS_PATH ${elementary-settings-daemon}/share/gsettings-schemas/${elementary-settings-daemon.name}/glib-2.0/schemas
   '';
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
-  PKG_CONFIG_DBUS_1_SYSTEM_BUS_SERVICES_DIR = "${placeholder ''out''}/share/dbus-1/system-services";
-  PKG_CONFIG_DBUS_1_SYSCONFDIR = "${placeholder ''out''}/etc";
-  PKG_CONFIG_POLKIT_GOBJECT_1_POLICYDIR = "${placeholder ''out''}/share/polkit-1/actions";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
+  PKG_CONFIG_DBUS_1_SYSTEM_BUS_SERVICES_DIR = "${placeholder "out"}/share/dbus-1/system-services";
+  PKG_CONFIG_DBUS_1_SYSCONFDIR = "${placeholder "out"}/etc";
+  PKG_CONFIG_POLKIT_GOBJECT_1_POLICYDIR = "${placeholder "out"}/share/polkit-1/actions";
 
   meta = with stdenv.lib; {
     description = "Switchboard Power Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/printers/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/printers/default.nix
index 5c303e04982b..d1feaaf0ea4f 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/printers/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/printers/default.nix
@@ -44,7 +44,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Printers Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/security-privacy/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/security-privacy/default.nix
index 19967c3bce05..042140546160 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/security-privacy/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/security-privacy/default.nix
@@ -49,7 +49,7 @@ stdenv.mkDerivation rec {
     zeitgeist
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   patches = [
     ./hardcode-gsettings.patch
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/sharing/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/sharing/default.nix
index b4aafb270062..87ae233916d8 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/sharing/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/sharing/default.nix
@@ -42,7 +42,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Sharing Plug";
diff --git a/pkgs/desktops/pantheon/apps/switchboard-plugs/sound/default.nix b/pkgs/desktops/pantheon/apps/switchboard-plugs/sound/default.nix
index ed3518c764f9..dee2f851e3fd 100644
--- a/pkgs/desktops/pantheon/apps/switchboard-plugs/sound/default.nix
+++ b/pkgs/desktops/pantheon/apps/switchboard-plugs/sound/default.nix
@@ -48,7 +48,7 @@ stdenv.mkDerivation rec {
     switchboard
   ];
 
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   meta = with stdenv.lib; {
     description = "Switchboard Sound Plug";
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/applications-menu/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/applications-menu/default.nix
index 9f40c0f9e582..ae138c9215c1 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/applications-menu/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/applications-menu/default.nix
@@ -70,11 +70,11 @@ stdenv.mkDerivation rec {
    ];
 
   mesonFlags = [
-    "--sysconfdir=${placeholder ''out''}/etc"
+    "--sysconfdir=${placeholder "out"}/etc"
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
-  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder ''out''}/lib/switchboard";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
+  PKG_CONFIG_SWITCHBOARD_2_0_PLUGSDIR = "${placeholder "out"}/lib/switchboard";
 
   patches = [
     (substituteAll {
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/bluetooth/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/bluetooth/default.nix
index 7e73adcd7e91..36d1cf0e77a3 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/bluetooth/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/bluetooth/default.nix
@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   postPatch = ''
     chmod +x meson/post_install.py
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/datetime/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/datetime/default.nix
index 1ab3c579e145..74408a4ed6d4 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/datetime/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/datetime/default.nix
@@ -71,7 +71,7 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   postPatch = ''
     chmod +x meson/post_install.py
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/keyboard/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/keyboard/default.nix
index 00a57cb99433..5431b982f540 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/keyboard/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/keyboard/default.nix
@@ -59,7 +59,7 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   meta = with stdenv.lib; {
     description = "Keyboard Indicator for Wingpanel";
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/network/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/network/default.nix
index d5ce97df509d..6ba19ebf77ee 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/network/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/network/default.nix
@@ -50,7 +50,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   meta = with stdenv.lib; {
     description = "Network Indicator for Wingpanel";
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/nightlight/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/nightlight/default.nix
index 0eab02bf8c80..0327d5e78e2c 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/nightlight/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/nightlight/default.nix
@@ -48,7 +48,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   meta = with stdenv.lib; {
     description = "Night Light Indicator for Wingpanel";
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/notifications/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/notifications/default.nix
index 78c901a23063..a4266a6f4595 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/notifications/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/notifications/default.nix
@@ -48,7 +48,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   meta = with stdenv.lib; {
     description = "Notifications Indicator for Wingpanel";
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/power/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/power/default.nix
index f63cca74a4dc..9f9d47030600 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/power/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/power/default.nix
@@ -54,7 +54,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   postPatch = ''
     chmod +x meson/post_install.py
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/session/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/session/default.nix
index b363cb5485a5..f48638ff2b16 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/session/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/session/default.nix
@@ -48,7 +48,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   meta = with stdenv.lib; {
     description = "Session Indicator for Wingpanel";
diff --git a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/sound/default.nix b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/sound/default.nix
index 6d0e791d1e41..038ab75094cd 100644
--- a/pkgs/desktops/pantheon/desktop/wingpanel-indicators/sound/default.nix
+++ b/pkgs/desktops/pantheon/desktop/wingpanel-indicators/sound/default.nix
@@ -56,7 +56,7 @@ stdenv.mkDerivation rec {
     wingpanel
   ];
 
-  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder ''out''}/lib/wingpanel";
+  PKG_CONFIG_WINGPANEL_2_0_INDICATORSDIR = "${placeholder "out"}/lib/wingpanel";
 
   postPatch = ''
     chmod +x meson/post_install.py
diff --git a/pkgs/desktops/pantheon/services/contractor/default.nix b/pkgs/desktops/pantheon/services/contractor/default.nix
index 6401b96a2eab..b10e97f77d73 100644
--- a/pkgs/desktops/pantheon/services/contractor/default.nix
+++ b/pkgs/desktops/pantheon/services/contractor/default.nix
@@ -46,7 +46,7 @@ stdenv.mkDerivation rec {
     libgee
   ];
 
-  PKG_CONFIG_DBUS_1_SESSION_BUS_SERVICES_DIR = "${placeholder ''out''}/share/dbus-1/services";
+  PKG_CONFIG_DBUS_1_SESSION_BUS_SERVICES_DIR = "${placeholder "out"}/share/dbus-1/services";
 
   meta = with stdenv.lib; {
     description = "A desktop-wide extension service used by elementary OS";