diff --git a/src/backend/utils/sort/logtape.c b/src/backend/utils/sort/logtape.c
index b518a4b9c5..31db75d6a4 100644
--- a/src/backend/utils/sort/logtape.c
+++ b/src/backend/utils/sort/logtape.c
@@ -379,7 +379,7 @@ ltsGetFreeBlock(LogicalTapeSet *lts)
 {
 	long	   *heap = lts->freeBlocks;
 	long		blocknum;
-	int			heapsize;
+	long		heapsize;
 	long		holeval;
 	unsigned long holepos;