diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index 5528c9ce90d..a67e17ba2c4 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -17199,7 +17199,7 @@ let
     pname = "Device-SerialPort";
     version = "1.04";
     src = fetchurl {
-      url = "mirror://cpan/authors/id/C/CO/COOK/${pname}-${version}.tar.gz";
+      url = "mirror://cpan/authors/id/C/CO/COOK/Device-SerialPort-1.04.tar.gz";
       sha256 = "1mz9a2qzkz6fbz76wcwmp48h6ckjxpcazb70q03acklvndy5d4nk";
     };
     meta = with stdenv.lib; {