--- /usr/lib/dtrace/ipfw.d.orig	2021-04-29 18:43:49.914816000 +0200
+++ /usr/lib/dtrace/ipfw.d	2021-04-29 18:42:14.618866000 +0200
@@ -28,6 +28,7 @@
  * $FreeBSD: stable/12/share/dtrace/ipfw.d 367553 2020-11-10 12:13:18Z ae $
  */
 
+#pragma D depends_on library ip
 #pragma D depends_on provider ipfw
 
 /* ipfw_chk() return values */