diff --git a/fs/smartfs/smartfs_smart.c b/fs/smartfs/smartfs_smart.c
index 23f36860fe..60a539c10f 100644
--- a/fs/smartfs/smartfs_smart.c
+++ b/fs/smartfs/smartfs_smart.c
@@ -1044,7 +1044,7 @@ static off_t smartfs_seek_internal(struct smartfs_mountpt_s *fs,
       break;
 
     case SEEK_END:
-      newpos = sf->entry.datlen - offset;
+      newpos = sf->entry.datlen + offset;
       break;
   }