diff --git a/fs/sync.c b/fs/sync.c
index aab5ffe..955aef0 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -100,7 +100,7 @@
 	}
 
 	if (nbytes == 0)
-		endbyte = -1;
+		endbyte = LLONG_MAX;
 	else
 		endbyte--;		/* inclusive */