diff --git a/variants/start/variant.c b/variants/start/variant.c
index f1c8a25..6df725a 100644
--- a/variants/start/variant.c
+++ b/variants/start/variant.c
@@ -163,6 +163,8 @@ HAL_TIMER32_CHANNEL_IndexTypeDef pwmPinToTimerChannel(uint32_t digPinNumber)
     return TIMER32_CHANNEL_2;
   case 3:
     return TIMER32_CHANNEL_3;
+  default:
+    return 255;
   }
 }