diff --git a/autoytarchive/cappedio.py b/autoytarchive/cappedio.py
index c11841c..344e946 100644
--- a/autoytarchive/cappedio.py
+++ b/autoytarchive/cappedio.py
@@ -14,7 +14,7 @@ class CappedBufferedReader(io.BufferedReader):
         return super().read(size)
 
     def seek(self, offset, whence=os.SEEK_SET):
-        if self.capped_size is not NOne:
+        if self.capped_size is not None:
             if offset == 0 and whence == os.SEEK_END:
                 if self.capped_size < 0:
                     offset = 0