diff --git a/geomagio/edge/MiniSeedFactory.py b/geomagio/edge/MiniSeedFactory.py
index 1f4ec1df1b12d0c6d284ccb940c1ae132b1f6a1c..0323519699fe85882d651be462cecad9d2de9e43 100644
--- a/geomagio/edge/MiniSeedFactory.py
+++ b/geomagio/edge/MiniSeedFactory.py
@@ -422,7 +422,7 @@ class MiniSeedFactory(TimeseriesFactory):
             elif suffix == "SV":
                 location_suffix = "V"
             elif suffix == "DDT":
-                location_suffix = "DT"
+                location_suffix = "R"
             elif suffix not in ("Bin", "Volt"):
                 raise TimeseriesFactoryException(
                     'bad channel suffix "%s", wanted "Dist", "SQ", or "SV"' % suffix