diff --git a/sys/net/if_stf.c b/sys/net/if_stf.c
index 00e34a236a99..f3a604255ddd 100644
--- a/sys/net/if_stf.c
+++ b/sys/net/if_stf.c
@@ -482,8 +482,6 @@ stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
 	}
 
 	M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
-	if (m && m->m_len < sizeof(struct ip))
-		m = m_pullup(m, sizeof(struct ip));
 	if (m == NULL) {
 		if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 		return ENOBUFS;
diff --git a/sys/netinet6/icmp6.c b/sys/netinet6/icmp6.c
index 0105479dcf54..6ef0d445b402 100644
--- a/sys/netinet6/icmp6.c
+++ b/sys/netinet6/icmp6.c
@@ -363,8 +363,6 @@ icmp6_error(struct mbuf *m, int type, int code, int param)
 
 	preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
 	M_PREPEND(m, preplen, M_NOWAIT);	/* FIB is also copied over. */
-	if (m && m->m_len < preplen)
-		m = m_pullup(m, preplen);
 	if (m == NULL) {
 		nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
 		return;