diff --git a/geomagio/Controller.py b/geomagio/Controller.py
index 8d9b42fd733646b52da2f3743bf96710a53d232d..8e8edad30bbfd9cee1a830f35af895d2c3aa0d8e 100644
--- a/geomagio/Controller.py
+++ b/geomagio/Controller.py
@@ -159,7 +159,9 @@ class Controller(object):
                     timeseries=timeseries,
                     renames=options.rename_input_channel)
         processed = algorithm.process(timeseries)
-        processed.trim(starttime=options.starttime, endtime=options.endtime)
+        # trim if --no-trim is not set
+        if not options.trim:
+            processed.trim(starttime=options.starttime, endtime=options.endtime)
         if options.rename_output_channel:
             processed = self._rename_channels(
                     timeseries=processed,