diff --git a/lib/Apache/Qpsmtpd.pm b/lib/Apache/Qpsmtpd.pm
index 9ad82ef..bd0729c 100644
--- a/lib/Apache/Qpsmtpd.pm
+++ b/lib/Apache/Qpsmtpd.pm
@@ -58,6 +58,7 @@ sub config_dir {
         $cdir_memo{$config} = $configdir;
     }
     else {
+        shift;
         $cdir_memo{$config} = $self->SUPER::config_dir(@_);
     }
     return $cdir_memo{$config};