diff --git a/sys/netinet/sctp_input.c b/sys/netinet/sctp_input.c
index 7691e61ea1f9..287c3ede2c3e 100644
--- a/sys/netinet/sctp_input.c
+++ b/sys/netinet/sctp_input.c
@@ -6023,10 +6023,10 @@ sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
 	}
 #endif
 	SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
-	    "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
+	    "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
 	    m->m_pkthdr.len,
 	    if_name(m->m_pkthdr.rcvif),
-	    (int)m->m_pkthdr.csum_flags);
+	    (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 	if (m->m_flags & M_FLOWID) {
 		mflowid = m->m_pkthdr.flowid;
 		use_mflowid = 1;
diff --git a/sys/netinet6/sctp6_usrreq.c b/sys/netinet6/sctp6_usrreq.c
index 74be85bbc722..511b0e831730 100644
--- a/sys/netinet6/sctp6_usrreq.c
+++ b/sys/netinet6/sctp6_usrreq.c
@@ -109,10 +109,10 @@ sctp6_input_with_port(struct mbuf **i_pak, int *offp, uint16_t port)
 	}
 #endif
 	SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
-	    "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
+	    "sctp6_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
 	    m->m_pkthdr.len,
 	    if_name(m->m_pkthdr.rcvif),
-	    (int)m->m_pkthdr.csum_flags);
+	    (int)m->m_pkthdr.csum_flags, CSUM_BITS);
 	if (m->m_flags & M_FLOWID) {
 		mflowid = m->m_pkthdr.flowid;
 		use_mflowid = 1;