diff --git a/geomagio/TimeseriesUtility.py b/geomagio/TimeseriesUtility.py
index 79cc482636837657bbcd7cab97a4cbc5a81de92f..e0729c21b81796707a06cff1184765aeab5be29c 100644
--- a/geomagio/TimeseriesUtility.py
+++ b/geomagio/TimeseriesUtility.py
@@ -304,7 +304,7 @@ def get_channels(stream):
         channel = trace.stats.channel
         if channel:
             channels[channel] = True
-    return [ch for ch in channels] or []
+    return [ch for ch in channels]
 
 
 def get_trace_value(traces, time, default=None):