diff --git a/src/backend/distributed/deparser/ruleutils_14.c b/src/backend/distributed/deparser/ruleutils_14.c
index 5e85ffe7b..c02801f7a 100644
--- a/src/backend/distributed/deparser/ruleutils_14.c
+++ b/src/backend/distributed/deparser/ruleutils_14.c
@@ -2358,6 +2358,8 @@ get_basic_select_query(Query *query, deparse_context *context,
 
 		appendContextKeyword(context, " GROUP BY ",
 							 -PRETTYINDENT_STD, PRETTYINDENT_STD, 1);
+		if (query->groupDistinct)
+			appendStringInfoString(buf, "DISTINCT ");
 
 		save_exprkind = context->special_exprkind;
 		context->special_exprkind = EXPR_KIND_GROUP_BY;