diff --git a/pkgs/build-support/fetchpatch/default.nix b/pkgs/build-support/fetchpatch/default.nix
index a9bfac320fb8..e3159d205301 100644
--- a/pkgs/build-support/fetchpatch/default.nix
+++ b/pkgs/build-support/fetchpatch/default.nix
@@ -27,4 +27,4 @@ fetchurl ({
       "$tmpfile" > "$out"
     ${args.postFetch or ""}
   '';
-} // builtins.removeAttrs args ["stripLen" "addPrefixes" "excludes"])
+} // builtins.removeAttrs args ["stripLen" "addPrefixes" "excludes" "postFetch"])