diff --git a/src/backend/executor/spi.c b/src/backend/executor/spi.c
index c044c1dbce2..b46b7074d70 100644
--- a/src/backend/executor/spi.c
+++ b/src/backend/executor/spi.c
@@ -1763,7 +1763,8 @@ spi_printtup(TupleTableSlot *slot, DestReceiver *self)
 
 	if (tuptable->free == 0)
 	{
-		tuptable->free = 256;
+		/* Double the size of the pointer array */
+		tuptable->free = tuptable->alloced;
 		tuptable->alloced += tuptable->free;
 		tuptable->vals = (HeapTuple *) repalloc(tuptable->vals,
 									  tuptable->alloced * sizeof(HeapTuple));