diff --git a/zipline/data/minute_bars.py b/zipline/data/minute_bars.py
index 8372db30..4baae88c 100644
--- a/zipline/data/minute_bars.py
+++ b/zipline/data/minute_bars.py
@@ -698,7 +698,7 @@ class BcolzMinuteBarWriter(object):
         last_minute_to_write = dts[-1]
 
         # In the event that we've already written some minutely data to the
-        # ctable, guard against overwritting that data.
+        # ctable, guard against overwriting that data.
         if num_rec_mins > 0:
             last_recorded_minute = np.datetime64(all_minutes[num_rec_mins - 1])
             if last_minute_to_write <= last_recorded_minute: