diff --git a/site_ansto/instrument/util/config_edit.py b/site_ansto/instrument/util/config_edit.py
index 98f5b96d..0ab6a1fe 100755
--- a/site_ansto/instrument/util/config_edit.py
+++ b/site_ansto/instrument/util/config_edit.py
@@ -269,7 +269,7 @@ class InstConfigData(object):
                 self.opt_dict[sect]['permanent'] = permanent
                 self.opt_dict[sect]['imptype'] = imptype
                 if stateval == True:
-                    if selected_imp == 'none' or (selected_imp in self.imp2opt_dict):
+                    if selected_imp == 'none' or (selected_imp in self.imp2opt_dict) and self.imp2opt_dict[selected_imp] != 'none':
                         self.opt_dict[sect]['enabled'] = False
                         self.opt_dict[sect]['selected_imp'] = 'none'
                     else: