diff --git a/sys/kern/uipc_mbuf.c b/sys/kern/uipc_mbuf.c
index 619f3a68cfca..6ba86b75a700 100644
--- a/sys/kern/uipc_mbuf.c
+++ b/sys/kern/uipc_mbuf.c
@@ -956,7 +956,7 @@ void
 m_print(const struct mbuf *m)
 {
 	int len;
-	struct mbuf *m2;
+	const struct mbuf *m2;
 
 	len = m->m_pkthdr.len;
 	m2 = m;