diff --git a/sys/contrib/ipfilter/netinet/ip_compat.h b/sys/contrib/ipfilter/netinet/ip_compat.h
index 3dbaee266edd..d0b26af2aa8e 100644
--- a/sys/contrib/ipfilter/netinet/ip_compat.h
+++ b/sys/contrib/ipfilter/netinet/ip_compat.h
@@ -543,7 +543,7 @@ MALLOC_DECLARE(M_IPFILTER);
 # ifndef ALLOC_MB_T
 #  ifdef MGETHDR
 #   define	ALLOC_MB_T(m,l)	do { \
-					MGETHDR((m), M_DONTWAIT, MT_HEADER); \
+					MGETHDR((m), M_NOWAIT, MT_HEADER); \
 					if ((m) != NULL) { \
 						(m)->m_len = (l); \
 						(m)->m_pkthdr.len = (l); \
@@ -551,7 +551,7 @@ MALLOC_DECLARE(M_IPFILTER);
 				} while (0)
 #  else
 #   define	ALLOC_MB_T(m,l)	do { \
-					MGET((m), M_DONTWAIT, MT_HEADER); \
+					MGET((m), M_NOWAIT, MT_HEADER); \
 					if ((m) != NULL) { \
 						(m)->m_len = (l); \
 						(m)->m_pkthdr.len = (l); \
diff --git a/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c b/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c
index 898869a797c7..3466c7ce969f 100644
--- a/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c
+++ b/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c
@@ -368,14 +368,14 @@ ipf_send_reset(fin)
 	hlen = sizeof(ip_t);
 #endif
 #ifdef MGETHDR
-	MGETHDR(m, M_DONTWAIT, MT_HEADER);
+	MGETHDR(m, M_NOWAIT, MT_HEADER);
 #else
-	MGET(m, M_DONTWAIT, MT_HEADER);
+	MGET(m, M_NOWAIT, MT_HEADER);
 #endif
 	if (m == NULL)
 		return -1;
 	if (sizeof(*tcp2) + hlen > MLEN) {
-		MCLGET(m, M_DONTWAIT);
+		MCLGET(m, M_NOWAIT);
 		if ((m->m_flags & M_EXT) == 0) {
 			FREE_MB_T(m);
 			return -1;
@@ -543,9 +543,9 @@ ipf_send_icmp_err(type, fin, dst)
 	if (ipf_checkl4sum(fin) == -1)
 		return -1;
 #ifdef MGETHDR
-	MGETHDR(m, M_DONTWAIT, MT_HEADER);
+	MGETHDR(m, M_NOWAIT, MT_HEADER);
 #else
-	MGET(m, M_DONTWAIT, MT_HEADER);
+	MGET(m, M_NOWAIT, MT_HEADER);
 #endif
 	if (m == NULL)
 		return -1;
@@ -599,7 +599,7 @@ ipf_send_icmp_err(type, fin, dst)
 			code = icmptoicmp6unreach[code];
 
 		if (iclen + max_linkhdr + fin->fin_plen > avail) {
-			MCLGET(m, M_DONTWAIT);
+			MCLGET(m, M_NOWAIT);
 			if ((m->m_flags & M_EXT) == 0) {
 				FREE_MB_T(m);
 				return -1;
@@ -730,7 +730,7 @@ ipf_fastroute(m0, mpp, fin, fdp)
 	* problem.
 	*/
 	if (M_WRITABLE(m) == 0) {
-		m0 = m_dup(m, M_DONTWAIT);
+		m0 = m_dup(m, M_NOWAIT);
 		if (m0 != 0) {
 			FREE_MB_T(m);
 			m = m0;
@@ -878,9 +878,9 @@ ipf_fastroute(m0, mpp, fin, fdp)
 	mhlen = sizeof (struct ip);
 	for (off = hlen + len; off < ntohs(ip->ip_len); off += len) {
 #ifdef MGETHDR
-		MGETHDR(m, M_DONTWAIT, MT_HEADER);
+		MGETHDR(m, M_NOWAIT, MT_HEADER);
 #else
-		MGET(m, M_DONTWAIT, MT_HEADER);
+		MGET(m, M_NOWAIT, MT_HEADER);
 #endif
 		if (m == 0) {
 			m = m0;