diff --git a/sys/kern/kern_umtx.c b/sys/kern/kern_umtx.c
--- a/sys/kern/kern_umtx.c
+++ b/sys/kern/kern_umtx.c
@@ -4367,7 +4367,7 @@
 	if (force) {
 		object = reg->ushm_obj->shm_object;
 		VM_OBJECT_WLOCK(object);
-		object->flags |= OBJ_UMTXDEAD;
+		vm_object_set_flag(object, OBJ_UMTXDEAD);
 		VM_OBJECT_WUNLOCK(object);
 	}
 	mtx_lock(&umtx_shm_lock);
diff --git a/sys/vm/vm_object.h b/sys/vm/vm_object.h
--- a/sys/vm/vm_object.h
+++ b/sys/vm/vm_object.h
@@ -317,7 +317,7 @@
 
 	if ((object->flags & OBJ_COLORED) == 0) {
 		object->pg_color = color;
-		object->flags |= OBJ_COLORED;
+		vm_object_set_flag(object, OBJ_COLORED);
 	}
 }
 
diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c
--- a/sys/vm/vm_object.c
+++ b/sys/vm/vm_object.c
@@ -744,7 +744,7 @@
 	vm_object_sub_shadow(backing_object);
 	if ((object->flags & OBJ_SHADOWLIST) != 0) {
 		LIST_REMOVE(object, shadow_list);
-		object->flags &= ~OBJ_SHADOWLIST;
+		vm_object_clear_flag(object, OBJ_SHADOWLIST);
 	}
 	object->backing_object = NULL;
 }
@@ -778,7 +778,7 @@
 		VM_OBJECT_ASSERT_WLOCKED(backing_object);
 		LIST_INSERT_HEAD(&backing_object->shadow_head, object,
 		    shadow_list);
-		object->flags |= OBJ_SHADOWLIST;
+		vm_object_set_flag(object, OBJ_SHADOWLIST);
 	}
 	object->backing_object = backing_object;
 }
@@ -1498,7 +1498,8 @@
 			vm_object_backing_insert(result, source);
 			result->domain = source->domain;
 #if VM_NRESERVLEVEL > 0
-			result->flags |= source->flags & OBJ_COLORED;
+			vm_object_set_flag(result,
+			    (source->flags & OBJ_COLORED));
 			result->pg_color = (source->pg_color +
 			    OFF_TO_IDX(*offset)) & ((1 << (VM_NFREEORDER -
 			    1)) - 1);