diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index b08641862e2..5f79ddea816 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -14,7 +14,7 @@ let
 
   callPackage = pkgs.newScope self;
 
-  buildPythonPackage = makeOverridable callPackage ../development/python-modules/generic { };
+  buildPythonPackage = makeOverridable (callPackage ../development/python-modules/generic { });
 
   # Unique python version identifier
   pythonName =