diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index ce89efc1941..7a7e07a4752 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -9012,7 +9012,7 @@ KeepLogSeg(XLogRecPtr recptr, XLogSegNo *logSegNo)
 	/* then check whether slots limit removal further */
 	if (max_replication_slots > 0 && keep != InvalidXLogRecPtr)
 	{
-		XLogRecPtr	slotSegNo;
+		XLogSegNo	slotSegNo;
 
 		XLByteToSeg(keep, slotSegNo);