diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 04e13458108593..4f10313bb50f9f 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4402,7 +4402,7 @@ in {
 
   scipy = let
     scipy_ = callPackage ../development/python-modules/scipy { };
-    scipy_1_2 = scipy_.overridePythonAttrs(oldAttrs: {
+    scipy_1_2 = scipy_.overridePythonAttrs(oldAttrs: rec {
       version = "1.2.1";
       src = oldAttrs.src.override {
         inherit version;