diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index 70373c51beec..e3262d66c9a8 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -6619,7 +6619,7 @@ let
     pname = "Email-MIME-ContentType";
     version = "1.024";
     src = fetchurl {
-      url = mirror://cpan/authors/id/R/RJ/RJBS/Email-MIME-ContentType-1.024.tar.gz;
+      url = "mirror://cpan/authors/id/R/RJ/RJBS/Email-MIME-ContentType-1.024.tar.gz";
       sha256 = "42d164ac7ff4dc2ea848e710fe21fa85509a3bcbb91ed2d356e4aba951ed8835";
     };
     meta = {