diff --git a/mne/channels/channels.py b/mne/channels/channels.py
index df55d707ef2..9586e1287dc 100644
--- a/mne/channels/channels.py
+++ b/mne/channels/channels.py
@@ -245,7 +245,7 @@ def set_channel_types(self, mapping):
                       'eog': FIFF.FIFF_UNIT_V,
                       'exci': FIFF.FIFF_UNIT_NONE,
                       'ias': FIFF.FIFF_UNIT_NONE,
-                      'misc': FIFF.FIFF_UNIT_NONE,
+                      'misc': FIFF.FIFF_UNIT_V,
                       'resp': FIFF.FIFF_UNIT_NONE,
                       'seeg': FIFF.FIFF_UNIT_V,
                       'stim': FIFF.FIFF_UNIT_NONE,