diff --git a/src/backend/executor/execParallel.c b/src/backend/executor/execParallel.c
index 0610180016..d66be0b301 100644
--- a/src/backend/executor/execParallel.c
+++ b/src/backend/executor/execParallel.c
@@ -55,7 +55,7 @@
 #define PARALLEL_KEY_DSA				UINT64CONST(0xE000000000000006)
 #define PARALLEL_KEY_QUERY_TEXT		UINT64CONST(0xE000000000000007)
 
-#define PARALLEL_TUPLE_QUEUE_SIZE		65536
+#define PARALLEL_TUPLE_QUEUE_SIZE		6553600
 
 /*
  * DSM structure for accumulating per-PlanState instrumentation.