diff --git a/pkgs/top-level/perl-packages.nix b/pkgs/top-level/perl-packages.nix
index 89706545031a..7a608ccd8ed5 100644
--- a/pkgs/top-level/perl-packages.nix
+++ b/pkgs/top-level/perl-packages.nix
@@ -5551,6 +5551,7 @@ let self = _self // overrides; _self = with self; {
     };
     buildInputs = [ FileSlurp URI ];
     propagatedBuildInputs = [ DateManip DigestMD5 MailMboxMessageParser TimeDate ];
+    outputs = [ "out" ];
     meta = {
       homepage = https://github.com/coppit/grepmail;
       description = "Search mailboxes for mail matching a regular expression";