diff --git a/sys/netinet6/ipcomp_input.c b/sys/netinet6/ipcomp_input.c
index 1831648a50de..be97fd1d6678 100644
--- a/sys/netinet6/ipcomp_input.c
+++ b/sys/netinet6/ipcomp_input.c
@@ -258,7 +258,7 @@ ipcomp6_input(mp, offp, proto)
 	off = *offp;
 
 	md = m_pulldown(m, off, sizeof(*ipcomp), NULL);
-	if (!m) {
+	if (!md) {
 		m = NULL;	/* already freed */
 		ipseclog((LOG_DEBUG, "IPv6 IPComp input: assumption failed "
 		    "(pulldown failure)\n"));