diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c
index 5945559a1e..f11b1b44f6 100644
--- a/src/backend/access/heap/heapam.c
+++ b/src/backend/access/heap/heapam.c
@@ -4770,7 +4770,7 @@ failed:
 	{
 		Assert(result == TM_SelfModified || result == TM_Updated ||
 			   result == TM_Deleted || result == TM_WouldBlock);
-		Assert(!(tuple->t_data->t_infomask & HEAP_XMAX_INVALID));
+		Assert(TM_WouldBlock || !(tuple->t_data->t_infomask & HEAP_XMAX_INVALID));
 		Assert(result != TM_Updated ||
 			   !ItemPointerEquals(&tuple->t_self, &tuple->t_data->t_ctid));
 		tmfd->ctid = tuple->t_data->t_ctid;