diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index 42a9a2952a5..58ea6f2e2f2 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -1521,6 +1521,7 @@ vm_page_set_validclean(vm_page_t m, int base, int size)
 	int endoff;
 
 	mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+	VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
 	if (size == 0)	/* handle degenerate case */
 		return;