diff --git a/pkgs/development/python-modules/sse-starlette/default.nix b/pkgs/development/python-modules/sse-starlette/default.nix
index 4491375e6c19..0a5708af8604 100644
--- a/pkgs/development/python-modules/sse-starlette/default.nix
+++ b/pkgs/development/python-modules/sse-starlette/default.nix
@@ -23,7 +23,7 @@
   uvicorn,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "sse-starlette";
   version = "3.4.5";
   pyproject = true;
@@ -31,7 +31,7 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "sysid";
     repo = "sse-starlette";
-    tag = "v${version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-b0iNu9CN4Tca2hGU0Rpr/v0Q4KWNPQNCp9BY5YnzjzA=";
   };
 
@@ -86,8 +86,8 @@ buildPythonPackage rec {
   meta = {
     description = "Server Sent Events for Starlette and FastAPI";
     homepage = "https://github.com/sysid/sse-starlette";
-    changelog = "https://github.com/sysid/sse-starlette/blob/${src.tag}/CHANGELOG.md";
+    changelog = "https://github.com/sysid/sse-starlette/blob/${finalAttrs.src.tag}/CHANGELOG.md";
     license = lib.licenses.bsd3;
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})