diff --git a/src/backend/executor/nodeForeignscan.c b/src/backend/executor/nodeForeignscan.c
index d50489c..2e36da0 100644
--- a/src/backend/executor/nodeForeignscan.c
+++ b/src/backend/executor/nodeForeignscan.c
@@ -44,7 +44,11 @@ ForeignNext(ForeignScanState *node)
 	ExprContext *econtext = node->ss.ps.ps_ExprContext;
 	MemoryContext oldcontext;
 
-	/* Call the Iterate function in short-lived context */
+	/*
+	 * Call the Iterate function in short-lived context. Reset it first
+	 * to free any leftovers from previous iteration.
+	 */
+	ResetExprContext(econtext);
 	oldcontext = MemoryContextSwitchTo(econtext->ecxt_per_tuple_memory);
 	slot = node->fdwroutine->IterateForeignScan(node);
 	MemoryContextSwitchTo(oldcontext);