diff --git a/pkgs/tools/misc/gringo/default.nix b/pkgs/tools/misc/gringo/default.nix
index 76c60023c063..6c5bac11e738 100644
--- a/pkgs/tools/misc/gringo/default.nix
+++ b/pkgs/tools/misc/gringo/default.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
     ./gringo-4.5.4-to_string.patch
   ];
 
-  patchPhase = stdenv.lib.optionalString stdenv.isDarwin ''
+  postPatch = stdenv.lib.optionalString stdenv.isDarwin ''
     substituteInPlace ./SConstruct \
       --replace \
         "env['CXX']            = 'g++'" \