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-rw-r--r--pkgs/development/libraries/gnome/libgnomeui/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/libraries/gnome/libgnomeui/default.nix b/pkgs/development/libraries/gnome/libgnomeui/default.nix
index 23f6b5e5b2df..9a97d7697a95 100644
--- a/pkgs/development/libraries/gnome/libgnomeui/default.nix
+++ b/pkgs/development/libraries/gnome/libgnomeui/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, pkgconfig, libgnome, libgnomecanvas, libbonoboui, libglade }:
 
-assert !isNull pkgconfig && !isNull libgnome && !isNull libgnomecanvas
-  && !isNull libbonoboui && !isNull libglade;
+assert pkgconfig != null && libgnome != null && libgnomecanvas != null
+  && libbonoboui != null && libglade != null;
 
 derivation {
   name = "libgnomeui-2.4.0.1";