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-rw-r--r--pkgs/development/libraries/gtk+-1/gtk+/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/gtk+-1/gtk+/default.nix b/pkgs/development/libraries/gtk+-1/gtk+/default.nix
index fc8f45736d97..7ee815ec5f68 100644
--- a/pkgs/development/libraries/gtk+-1/gtk+/default.nix
+++ b/pkgs/development/libraries/gtk+-1/gtk+/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, x11, glib}:
 
-assert !isNull x11 && !isNull glib;
+assert x11 != null && glib != null;
 assert x11.buildClientLibs;
 
 derivation {