diff --git a/default.nix b/default.nix
index 77b63b6..ffd5d28 100644
--- a/default.nix
+++ b/default.nix
@@ -22,7 +22,7 @@ self: super: rec {
           pygments
           poetry
         ];
-        src = fetchPypi {
+        src = python-super.fetchPypi {
           inherit pname version;
           sha256 = "b6e007281cf29a66eeba66a512744853d8aa53b4ca2525befb6f350bb7b24df6";
         };