diff --git a/pkgs/development/libraries/pixman/default.nix b/pkgs/development/libraries/pixman/default.nix
index d50c0c5d69c..74d7706ec59 100644
--- a/pkgs/development/libraries/pixman/default.nix
+++ b/pkgs/development/libraries/pixman/default.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
 
   postInstall = glib.flattenInclude;
 
-  patches = stdenv.lib.optional stdenv.cc.isClang ./fix-clang36.patch;
+  patches = stdenv.lib.optional stdenv.isDarwin ./fix-clang36.patch;
 
   meta = {
     homepage = http://pixman.org;