diff --git a/pkgs/by-name/a2/a2ps/package.nix b/pkgs/by-name/a2/a2ps/package.nix
index 1f4b30713050..3e4510996abc 100644
--- a/pkgs/by-name/a2/a2ps/package.nix
+++ b/pkgs/by-name/a2/a2ps/package.nix
@@ -22,8 +22,8 @@ stdenv.mkDerivation (finalAttrs: {
   };
 
   postPatch = ''
-    substituteInPlace afm/make_fonts_map.sh --replace "/bin/rm" "rm"
-    substituteInPlace tests/defs.in --replace "/bin/rm" "rm"
+    substituteInPlace afm/make_fonts_map.sh --replace-fail "/bin/rm" "rm"
+    substituteInPlace tests/defs.in --replace-fail "/bin/rm" "rm"
   '';
 
   nativeBuildInputs = [