diff --git a/sys/netipsec/key_debug.c b/sys/netipsec/key_debug.c
index 58f2d2b614c5..3705879397ff 100644
--- a/sys/netipsec/key_debug.c
+++ b/sys/netipsec/key_debug.c
@@ -920,9 +920,9 @@ void
 kdebug_mbuf(const struct mbuf *m0)
 {
 	const struct mbuf *m = m0;
-	int i, j;
+	int i;
 
-	for (j = 0; m; m = m->m_next) {
+	for (; m; m = m->m_next) {
 		kdebug_mbufhdr(m);
 		printf("  m_data:\n");
 		for (i = 0; i < m->m_len; i++) {
@@ -931,7 +931,6 @@ kdebug_mbuf(const struct mbuf *m0)
 			if (i % 4 == 0)
 				printf(" ");
 			printf("%02x", mtod(m, const u_char *)[i]);
-			j++;
 		}
 		printf("\n");
 	}