diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index 30a34658433..9b6ce732874 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -2355,7 +2355,7 @@ let
     pname = "CGI-Simple";
     version = "1.25";
     src = fetchurl {
-      url = mirror://cpan/authors/id/M/MA/MANWAR/CGI-Simple-1.25.tar.gz;
+      url = "mirror://cpan/authors/id/M/MA/MANWAR/CGI-Simple-1.25.tar.gz";
       sha256 = "0zpl7sa8jvv3zba2vcxf3qsrjk7kk2vcznfdpmxydw06x8vczrp5";
     };
     propagatedBuildInputs = [ IOStringy ];