diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index d610242f29b..5cfc59772a3 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -5060,7 +5060,7 @@ let
     pname = "DateTime-Format-Strptime";
     version = "1.77";
     src = fetchurl {
-      url = mirror://cpan/authors/id/D/DR/DROLSKY/DateTime-Format-Strptime-1.77.tar.gz;
+      url = "mirror://cpan/authors/id/D/DR/DROLSKY/DateTime-Format-Strptime-1.77.tar.gz";
       sha256 = "2fa43c838ecf5356f221a91a41c81dba22e7860c5474b4a61723259898173e4a";
     };
     buildInputs = [ TestFatal TestWarnings ];