diff --git a/lib/Lacuna/RPC/Inbox.pm b/lib/Lacuna/RPC/Inbox.pm
index b7114ff6..112d399d 100644
--- a/lib/Lacuna/RPC/Inbox.pm
+++ b/lib/Lacuna/RPC/Inbox.pm
@@ -122,7 +122,7 @@ sub send_message {
             }
         }
     }
-    my $max_messages = 100 + (($empire->date_created->epoch - time)/3600) + ( $empire->alliance_id ? 50 : 0 );
+    my $max_messages = 100 + int((time - $empire->date_created->epoch)/3600) + ( $empire->alliance_id ? 50 : 0 );
     if ($send_count > $max_messages) {
         confess [1010, "You have already sent the maximum number (".$max_messages.") of messages you can send for one day."];
     }