diff --git a/geomagio/algorithm/AdjustedAlgorithm.py b/geomagio/algorithm/AdjustedAlgorithm.py
index 123069038a59428e259bdc16297891c4e7cf229c..35a693bc486a00fe7001f06297aaa9f6cf53440b 100644
--- a/geomagio/algorithm/AdjustedAlgorithm.py
+++ b/geomagio/algorithm/AdjustedAlgorithm.py
@@ -239,4 +239,4 @@ class AdjustedAlgorithm(Algorithm):
             self.outchannels = ["H", "E", "Z", "F"]
         else:
             self.inchannels = arguments.inchannels
-            self.outchannels = arguments.outchannels
+            self.outchannels = arguments.outchannels or arguments.inchannels