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-rw-r--r--pkgs/development/libraries/gtk+/atk/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/gtk+/atk/default.nix b/pkgs/development/libraries/gtk+/atk/default.nix
index 8db047f9c492..7d45fbca050e 100644
--- a/pkgs/development/libraries/gtk+/atk/default.nix
+++ b/pkgs/development/libraries/gtk+/atk/default.nix
@@ -1,6 +1,6 @@
 {stdenv, fetchurl, pkgconfig, glib, perl}:
 
-assert !isNull pkgconfig && !isNull glib && !isNull perl;
+assert pkgconfig != null && glib != null && perl != null;
 
 derivation {
   name = "atk-1.2.4";