--- src/sys/net/if.c	2005/06/03 23:23:03	1.37
+++ src/sys/net/if.c	2005/06/04 14:41:57	1.38
@@ -364,6 +364,13 @@ if_detach(struct ifnet *ifp)
 		IFAFREE(ifa);
 	}
 
+#ifdef INET
+	/*
+	 * Remove all IPv4 kernel structures related to ifp.
+	 */
+	in_ifdetach(ifp);
+#endif
+
 #ifdef INET6
 	/*
 	 * Remove all IPv6 kernel structs related to ifp.  This should be done