diff --git a/sys/sys/mbuf.h b/sys/sys/mbuf.h
--- a/sys/sys/mbuf.h
+++ b/sys/sys/mbuf.h
@@ -1607,6 +1607,12 @@
 	return (STAILQ_LAST(&mq->mq_head, mbuf, m_stailqpkt));
 }
 
+static inline bool
+mbufq_empty(const struct mbufq *mq)
+{
+	return (mq->mq_len == 0);
+}
+
 static inline int
 mbufq_full(const struct mbufq *mq)
 {