diff --git a/radio/src/dataconstants.h b/radio/src/dataconstants.h
index 455221c92..077ee68ac 100644
--- a/radio/src/dataconstants.h
+++ b/radio/src/dataconstants.h
@@ -708,7 +708,7 @@ enum MixSources {
   MIXSRC_LAST_TELEM = MIXSRC_FIRST_TELEM+3*MAX_TELEMETRY_SENSORS-1
 };
 
-static_assert(MIXSRC_FIRST_LOGICAL_SWITCH == MIXSRC_FIRST_SWITCH + NUM_SWITCHES);
+static_assert(MIXSRC_FIRST_LOGICAL_SWITCH == MIXSRC_FIRST_SWITCH + NUM_SWITCHES, "Wrong switches definition in MIXSRC list");
 
 #define MIXSRC_FIRST        (MIXSRC_NONE + 1)
 #define MIXSRC_LAST         MIXSRC_LAST_CH