diff --git a/src/backend/utils/sort/logtape.c b/src/backend/utils/sort/logtape.c
index 666a7c0e81c..4984f8ce50a 100644
--- a/src/backend/utils/sort/logtape.c
+++ b/src/backend/utils/sort/logtape.c
@@ -782,7 +782,7 @@ LogicalTapeWrite(LogicalTapeSet *lts, int tapenum,
 	Assert(lt->buffer_size == BLCKSZ);
 	while (size > 0)
 	{
-		if (lt->pos >= TapeBlockPayloadSize)
+		if (lt->pos >= (int) TapeBlockPayloadSize)
 		{
 			/* Buffer full, dump it out */
 			long		nextBlockNumber;