diff --git a/pkgs/by-name/co/cosmic-launcher/package.nix b/pkgs/by-name/co/cosmic-launcher/package.nix
index fd90a88b85c4..14b39523f618 100644
--- a/pkgs/by-name/co/cosmic-launcher/package.nix
+++ b/pkgs/by-name/co/cosmic-launcher/package.nix
@@ -52,7 +52,7 @@ rustPlatform.buildRustPackage rec {
   ];
 
   postPatch = ''
-    substituteInPlace justfile --replace '#!/usr/bin/env' "#!$(command -v env)"
+    substituteInPlace justfile --replace-fail '#!/usr/bin/env' "#!$(command -v env)"
   '';
 
   postInstall = ''