diff --git a/autoytarchive/cappedio.py b/autoytarchive/cappedio.py
index 344e946..24d2321 100644
--- a/autoytarchive/cappedio.py
+++ b/autoytarchive/cappedio.py
@@ -29,7 +29,7 @@ class CappedBufferedReader(io.BufferedReader):
             elif whence == os.SEEK_SET:
                 current_pos = self.tell()
                 if current_pos > offset:
-                    self.capped_size += current_pos - offset
+                    self.capped_size += current_pos
         return super().seek(offset, whence)
 
     @property