diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index e2f00061bac..bae35a4d676 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -16988,7 +16988,7 @@ let
     pname = "RT-Client-REST";
     version = "0.60";
     src = fetchurl {
-      url = mirror://cpan/authors/id/D/DJ/DJZORT/RT-Client-REST-0.60.tar.gz;
+      url = "mirror://cpan/authors/id/D/DJ/DJZORT/RT-Client-REST-0.60.tar.gz";
       sha256 = "0e6f2da3d96903491b43b19c61221cbeea88414264f907312f277daaf144248b";
     };
     buildInputs = [ CGI HTTPServerSimple TestException ];