diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index 680085096a..03589da013 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -1992,7 +1992,7 @@ grouping_planner(PlannerInfo *root, bool inheritance_update,
 		{
 			scanjoin_target = make_group_input_target(root, final_target);
 			scanjoin_target_parallel_safe =
-				is_parallel_safe(root, (Node *) grouping_target->exprs);
+				is_parallel_safe(root, (Node *) scanjoin_target->exprs);
 		}
 		else
 		{