diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index ac97575453..443ab08d75 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -1418,7 +1418,7 @@ grouping_planner(PlannerInfo *root, double tuple_fraction)
 		else if (parse->groupClause)
 		{
 			/* Preprocess regular GROUP BY clause, if any */
-			root->processed_groupClause = list_copy(parse->groupClause);;
+			root->processed_groupClause = list_copy(parse->groupClause);
 			/* Remove any redundant GROUP BY columns */
 			remove_useless_groupby_columns(root);
 		}