diff --git a/sys/netinet/udp_usrreq.c b/sys/netinet/udp_usrreq.c
index f357905568f..589fbef76d1 100644
--- a/sys/netinet/udp_usrreq.c
+++ b/sys/netinet/udp_usrreq.c
@@ -208,7 +208,8 @@ udp_input(m, off, proto)
 	 * Save a copy of the IP header in case we want restore it
 	 * for sending an ICMP error message in response.
 	 */
-	save_ip = *ip;
+	if (!blackhole)
+		save_ip = *ip;
 
 	/*
 	 * Checksum extended UDP header and data.