diff --git a/src/dexorder/final_ohlc.py b/src/dexorder/final_ohlc.py
index bd644d6..395d7ae 100644
--- a/src/dexorder/final_ohlc.py
+++ b/src/dexorder/final_ohlc.py
@@ -30,7 +30,7 @@ class OHLCFilePath:
             self.start = start = datetime(time.year, time.month, time.day, tzinfo=timezone.utc)
             self.end = self.start + timedelta(days=1)
             self.file_interval = timedelta(days=1)
-            self.filepath += f'{start.year}/{start.month}/{symbol}-{name}-{start:%Y%m%d}.csv'
+            self.filepath += f'{start.year}/{start.month:02}/{symbol}-{name}-{start:%Y%m%d}.csv'
         elif period < timedelta(days=1):
             # one file per month
             # log.debug(f'{name} is monthly')