diff --git a/sys/kern/subr_lock.c b/sys/kern/subr_lock.c
index d99df8b..0df7e5a 100644
--- a/sys/kern/subr_lock.c
+++ b/sys/kern/subr_lock.c
@@ -208,6 +208,7 @@ lock_init(struct lock_object *lock, stru
 			break;
 		}
 	KASSERT(i < LOCK_CLASS_MAX, ("unknown lock class %p", class));
+	KASSERT(name != NULL, ("lock has no name"));
 
 	/* Initialize the lock object. */
 	lock->lo_name = name;