diff --git a/sys/sys/mbuf.h b/sys/sys/mbuf.h
index cea2c382014..51dac927e42 100644
--- a/sys/sys/mbuf.h
+++ b/sys/sys/mbuf.h
@@ -444,7 +444,7 @@ m_epg_pagelen(const struct mbuf *m, int pidx, int pgoff)
 	    "too large header length");					\
 } while (0)
 #else
-#define	MBUF_EXT_PGS_ASSERT_SANITY(m)	do {} while (0);
+#define	MBUF_EXT_PGS_ASSERT_SANITY(m)	do {} while (0)
 #endif
 #endif
 
@@ -781,7 +781,7 @@ union if_snd_tag_alloc_params;
 		    "Sleeping in \"%s\"", __func__);			\
 } while (0)
 #else
-#define	MBUF_CHECKSLEEP(how)
+#define	MBUF_CHECKSLEEP(how) do {} while (0)
 #endif
 
 /*
@@ -1161,7 +1161,7 @@ m_extrefcnt(struct mbuf *m)
 		    ("%s: chain %p contains an unmapped mbuf", __func__, (m)));\
 } while (0)
 #else
-#define	M_ASSERTMAPPED(m)
+#define	M_ASSERTMAPPED(m) do {} while (0)
 #endif
 
 /*