diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index e8b619926ef..52bd2f792d7 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -4408,7 +4408,7 @@ columnList:
 		;
 
 optionalPeriodName:
-			',' PERIOD columnElem { $$ = $3; }
+			',' columnElem { $$ = $2; }
 			| /*EMPTY*/               { $$ = NULL; }
 	;