diff --git a/pkgs/tools/misc/mc/default.nix b/pkgs/tools/misc/mc/default.nix
index 674b39c51af..99944c7f824 100644
--- a/pkgs/tools/misc/mc/default.nix
+++ b/pkgs/tools/misc/mc/default.nix
@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
       --replace /bin/rm ${coreutils}/bin/rm
   '';
 
-  postFixup = ''
+  preFixup = ''
     # remove unwanted build-dependency references
     sed -i -e "s!PKG_CONFIG_PATH=''${PKG_CONFIG_PATH}!PKG_CONFIG_PATH=$(echo "$PKG_CONFIG_PATH" | sed -e 's/./0/g')!" $out/bin/mc
   '';