diff --git a/pkgs/by-name/ac/acpilight/package.nix b/pkgs/by-name/ac/acpilight/package.nix
index 737d1e5727ba..79a45f5dbe72 100644
--- a/pkgs/by-name/ac/acpilight/package.nix
+++ b/pkgs/by-name/ac/acpilight/package.nix
@@ -24,8 +24,8 @@ stdenv.mkDerivation rec {
   );
 
   postConfigure = ''
-    substituteInPlace 90-backlight.rules --replace /bin ${coreutils}/bin
-    substituteInPlace Makefile --replace udevadm true
+    substituteInPlace 90-backlight.rules --replace-fail /bin ${coreutils}/bin
+    substituteInPlace Makefile --replace-fail udevadm true
   '';
 
   buildInputs = [ pyenv ];