diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index 1afed7ad71e1..7211b29a017c 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -22380,7 +22380,7 @@ let
     pname = "YAML-LibYAML";
     version = "0.82";
     src = fetchurl {
-      url = mirror://cpan/authors/id/T/TI/TINITA/YAML-LibYAML-0.82.tar.gz;
+      url = "mirror://cpan/authors/id/T/TI/TINITA/YAML-LibYAML-0.82.tar.gz";
       sha256 = "0j7yhxkaasccynl5iq1cqpf4x253p4bi5wsq6qbwwv2wjsiwgd02";
     };
   };