diff --git a/src/backend/backup/basebackup_incremental.c b/src/backend/backup/basebackup_incremental.c
index ceec1f44312..7c8138e0386 100644
--- a/src/backend/backup/basebackup_incremental.c
+++ b/src/backend/backup/basebackup_incremental.c
@@ -854,7 +854,7 @@ GetFileBackupMethod(IncrementalBackupInfo *ib, const char *path,
 	{
 		unsigned	relative_limit = limit_block - segno * RELSEG_SIZE;
 
-		if (*truncation_block_length < relative_limit)
+		if (*truncation_block_length > relative_limit)
 			*truncation_block_length = relative_limit;
 	}