diff --git a/pkgs/default.nix b/pkgs/default.nix
index 6ca27e42..6ce69cc9 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -66,7 +66,7 @@ pkgs {
       '';
 
       fractalide-tests-flat = fractalide-tests.overrideAttrs (oldAttrs: {
-        buildInputs = [ fractalide.override { flat = true; } ];
+        buildInputs = [ (fractalide.override { flat = true; }) ];
       });
     })
   ];