diff --git a/src/stepcount/stepcount.py b/src/stepcount/stepcount.py
index a967801..8169bde 100644
--- a/src/stepcount/stepcount.py
+++ b/src/stepcount/stepcount.py
@@ -269,7 +269,7 @@ def _mean(x, min_wear=None, dt=None):
         # crude (unadjusted) estimates ignore NAs
         minutely = v.resample('T').agg(_mean).rename('ENMO(mg)')
         hourly = v.resample('H').agg(_mean).rename('ENMO(mg)')
-        daily = v.resample('D').agg(_mean).rename('ENMO(mg')
+        daily = v.resample('D').agg(_mean).rename('ENMO(mg)')
         avg = daily.agg(_mean)
 
     return {