diff --git a/companion/src/firmwares/generalsettings.cpp b/companion/src/firmwares/generalsettings.cpp
index 7f50545e121..d4912c07c02 100644
--- a/companion/src/firmwares/generalsettings.cpp
+++ b/companion/src/firmwares/generalsettings.cpp
@@ -413,8 +413,8 @@ void GeneralSettings::convert(RadioDataConversionState & cstate)
 
   //  Try to intelligently copy any custom controls
   //  step 1 clear current config
-  memset(&inputConfig[0], '0', sizeof(InputConfig) * CPN_MAX_INPUTS);
-  memset(&switchConfig[0], '0', sizeof(SwitchConfig) * CPN_MAX_SWITCHES);
+  memset(&inputConfig[0], 0, sizeof(InputConfig) * CPN_MAX_INPUTS);
+  memset(&switchConfig[0], 0, sizeof(SwitchConfig) * CPN_MAX_SWITCHES);
   //  step 2 load default config
   setDefaultControlTypes(cstate.toType);
   //  step 3 copy matching config based on tags