diff --git a/src/backend/executor/nodeSubplan.c b/src/backend/executor/nodeSubplan.c
index 14980f86e5e..4800300a670 100644
--- a/src/backend/executor/nodeSubplan.c
+++ b/src/backend/executor/nodeSubplan.c
@@ -1107,7 +1107,7 @@ ExecSetParamPlan(SubPlanState *node, ExprContext *econtext, QueryDesc *queryDesc
 	SubLinkType subLinkType = subplan->subLinkType;
 	EState	   *estate = planstate->state;
 	ScanDirection dir = estate->es_direction;
-	MemoryContext oldcontext = NULL;
+	volatile MemoryContext oldcontext = NULL;
 	TupleTableSlot *slot;
 	ListCell   *pvar;
 	ListCell   *l;