diff --git a/pkgs/development/libraries/fontconfig/default.nix b/pkgs/development/libraries/fontconfig/default.nix
index 9c4116c8f0ba..1109582ad64f 100644
--- a/pkgs/development/libraries/fontconfig/default.nix
+++ b/pkgs/development/libraries/fontconfig/default.nix
@@ -39,7 +39,8 @@ stdenv.mkDerivation rec {
   # additionally required for the glibc-2.25 patch; avoid requiring gperf
   postPatch = ''
     sed s/CHAR_WIDTH/CHARWIDTH/g -i src/fcobjshash.{h,gperf}
-    touch src/*
+    sleep 2
+    touch src/fcobjshash.h
   '';
 
   outputs = [ "bin" "dev" "lib" "out" ]; # $out contains all the config