diff --git a/pkgs/development/python-modules/volatile/default.nix b/pkgs/development/python-modules/volatile/default.nix
index 1fbf36b05a59..d0927e353c93 100644
--- a/pkgs/development/python-modules/volatile/default.nix
+++ b/pkgs/development/python-modules/volatile/default.nix
@@ -6,7 +6,7 @@
   setuptools,
 }:
 
-buildPythonPackage rec {
+buildPythonPackage (finalAttrs: {
   pname = "volatile";
   version = "2.1.0";
   pyproject = true;
@@ -14,7 +14,7 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "mbr";
     repo = "volatile";
-    tag = version;
+    tag = finalAttrs.version;
     hash = "sha256-TYUvr0bscM/FaPk9oiF4Ob7HdKa2HlbpEFmaPfh4ir0=";
   };
 
@@ -30,4 +30,4 @@ buildPythonPackage rec {
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ fab ];
   };
-}
+})