diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index 5dae98590e1..f23183301cb 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -20790,7 +20790,7 @@ let
     pname = "Test-utf8";
     version = "1.02";
     src = fetchurl {
-      url = mirror://cpan/authors/id/M/MA/MARKF/Test-utf8-1.02.tar.gz;
+      url = "mirror://cpan/authors/id/M/MA/MARKF/Test-utf8-1.02.tar.gz";
       sha256 = "df82f09c5940830b25a49f1c8162fa24d371e602880edef8d9a4d4bfd66b8bd7";
     };
     meta = {