diff --git a/ox/vtt.py b/ox/vtt.py
index 443a8ea..899497c 100644
--- a/ox/vtt.py
+++ b/ox/vtt.py
@@ -3,7 +3,7 @@
 import codecs
 
 import ox
-import srt
+from . import srt
 
 def _webvtt_timecode(t):
     return ox.format_duration(t * 1000, years=False)