diff --git a/pkgs/tools/misc/thefuck/default.nix b/pkgs/tools/misc/thefuck/default.nix
index 87d6dcfb0c2e..13f741c5444f 100644
--- a/pkgs/tools/misc/thefuck/default.nix
+++ b/pkgs/tools/misc/thefuck/default.nix
@@ -18,7 +18,7 @@ buildPythonApplication rec {
 
   checkInputs = [ go mock pytestCheckHook pytest-mock ];
 
-  disabledTests = lib.optional stdenv.isDarwin [
+  disabledTests = lib.optionals stdenv.isDarwin [
     "test_settings_defaults"
     "test_from_file"
     "test_from_env"