diff --git a/pkgs/development/python-modules/configargparse/default.nix b/pkgs/development/python-modules/configargparse/default.nix
index 3e345b3dcd41..7c1594e9e805 100644
--- a/pkgs/development/python-modules/configargparse/default.nix
+++ b/pkgs/development/python-modules/configargparse/default.nix
@@ -12,7 +12,7 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "bw2";
     repo = "ConfigArgParse";
-    rev = version;
+    rev = "v${version}";
     sha256 = "1dsai4bilkp2biy9swfdx2z0k4akw4lpvx12flmk00r80hzgbglz";
   };