diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index 523d43558d5f..a0da9bb40e32 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -1328,9 +1328,11 @@ vm_page_next(vm_page_t m)
 	vm_page_t next;
 
 	VM_OBJECT_ASSERT_LOCKED(m->object);
-	if ((next = TAILQ_NEXT(m, listq)) != NULL &&
-	    next->pindex != m->pindex + 1)
-		next = NULL;
+	if ((next = TAILQ_NEXT(m, listq)) != NULL) {
+		MPASS(next->object == m->object);
+		if (next->pindex != m->pindex + 1)
+			next = NULL;
+	}
 	return (next);
 }
 
@@ -1346,9 +1348,11 @@ vm_page_prev(vm_page_t m)
 	vm_page_t prev;
 
 	VM_OBJECT_ASSERT_LOCKED(m->object);
-	if ((prev = TAILQ_PREV(m, pglist, listq)) != NULL &&
-	    prev->pindex != m->pindex - 1)
-		prev = NULL;
+	if ((prev = TAILQ_PREV(m, pglist, listq)) != NULL) {
+		MPASS(prev->object == m->object);
+		if (prev->pindex != m->pindex - 1)
+			prev = NULL;
+	}
 	return (prev);
 }