diff --git a/pkgs/development/python-modules/pwlf/default.nix b/pkgs/development/python-modules/pwlf/default.nix
index 8f420e45d61e..2e6e4ca8e361 100644
--- a/pkgs/development/python-modules/pwlf/default.nix
+++ b/pkgs/development/python-modules/pwlf/default.nix
@@ -18,7 +18,7 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "cjekel";
     repo = "piecewise_linear_fit_py";
-    tag = "v.${version}";
+    tag = "v${version}";
     hash = "sha256-TamFg+bX8QPRjY0HdrYviJRP8VwM7ucDFE2eZz5xNr0=";
   };