diff --git a/sys/bootstrap/tar.c b/sys/bootstrap/tar.c
index 7be6544..f447404 100644
--- a/sys/bootstrap/tar.c
+++ b/sys/bootstrap/tar.c
@@ -191,7 +191,7 @@ static enum fs_status file_read(
 	size_t w;
 	xpc_buffer_write(buf, src, count, &w);
 
-	offset += count;
+	offset += w;
 	*seek = offset;
 
 	return FS_SUCCESS;