diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 67e42e5df29..a5ac38578f6 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -8137,12 +8137,12 @@ ATExecSetNotNull(List **wqueue, Relation rel, char *conName, char *colName,
 	ccon = linitial(cooked);
 	ObjectAddressSet(address, ConstraintRelationId, ccon->conoid);
 
-	InvokeObjectPostAlterHook(RelationRelationId,
-							  RelationGetRelid(rel), attnum);
-
 	/* Mark pg_attribute.attnotnull for the column and queue validation */
 	set_attnotnull(wqueue, rel, attnum, true, true);
 
+	InvokeObjectPostAlterHook(RelationRelationId,
+							  RelationGetRelid(rel), attnum);
+
 	/*
 	 * Recurse to propagate the constraint to children that don't have one.
 	 */