diff --git a/pkgs/development/python-modules/simplejson/default.nix b/pkgs/development/python-modules/simplejson/default.nix
index 1e6def5ae78a..74530b3fb830 100644
--- a/pkgs/development/python-modules/simplejson/default.nix
+++ b/pkgs/development/python-modules/simplejson/default.nix
@@ -12,7 +12,7 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = pname;
     repo = pname;
-    rev = "v${version}";
+    rev = "refs/tags/v${version}";
     sha256 = "1irlp5sakbdfcf717qmrx0r9rjlmwk0vza6zm3y55d32zw5c1cxg";
   };