diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index 0f61446081a..6894675e046 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -5653,7 +5653,7 @@ let
     pname = "DBIx-Class-Helpers";
     version = "2.036000";
     src = fetchurl {
-      url = mirror://cpan/authors/id/F/FR/FREW/DBIx-Class-Helpers-2.036000.tar.gz;
+      url = "mirror://cpan/authors/id/F/FR/FREW/DBIx-Class-Helpers-2.036000.tar.gz";
       sha256 = "b7b8b4891a983c034ef0b45f4112404a0a40550c4e217daeb7a22ca16861efdb";
     };
     buildInputs = [ DBDSQLite DateTimeFormatSQLite TestDeep TestFatal TestRoo aliased ];