diff --git a/etc/inc/filter.inc b/etc/inc/filter.inc
index 57ae66a2e4..958367366e 100644
--- a/etc/inc/filter.inc
+++ b/etc/inc/filter.inc
@@ -146,7 +146,7 @@ function filter_configure_sync() {
 					mwexec("/sbin/kldload ipfw");
 					unmute_kernel_msgs();
 				}
-				exec("/sbin/ipfw delete 1-500");
+				exec("/sbin/ipfw delete set 9");
 			}
 	}