diff --git a/src/backend/distributed/executor/multi_utility.c b/src/backend/distributed/executor/multi_utility.c
index 33155dbeb..d3e287b06 100644
--- a/src/backend/distributed/executor/multi_utility.c
+++ b/src/backend/distributed/executor/multi_utility.c
@@ -1049,7 +1049,7 @@ DeparseVacuumStmtPrefix(VacuumStmt *vacuumStmt)
 {
 	StringInfo vacuumPrefix = makeStringInfo();
 	int vacuumFlags = vacuumStmt->options;
-	const int unsupportedFlags = ~(
+	const int unsupportedFlags PG_USED_FOR_ASSERTS_ONLY = ~(
 		VACOPT_ANALYZE |
 #if (PG_VERSION_NUM >= 90600)
 		VACOPT_DISABLE_PAGE_SKIPPING |