diff --git a/Firmware/sound.h b/Firmware/sound.h
index a80d0155..9e01f31b 100644
--- a/Firmware/sound.h
+++ b/Firmware/sound.h
@@ -4,13 +4,13 @@
 
 
 #define e_SOUND_MODE_NULL 0xFF
-typedef enum
+typedef enum : uint8_t
      {e_SOUND_MODE_LOUD,e_SOUND_MODE_ONCE,e_SOUND_MODE_SILENT,e_SOUND_MODE_BLIND} eSOUND_MODE;
 #define e_SOUND_MODE_DEFAULT e_SOUND_MODE_LOUD
 
-typedef enum
+typedef enum : uint8_t
      {e_SOUND_TYPE_ButtonEcho,e_SOUND_TYPE_EncoderEcho,e_SOUND_TYPE_StandardPrompt,e_SOUND_TYPE_StandardConfirm,e_SOUND_TYPE_StandardWarning,e_SOUND_TYPE_StandardAlert,e_SOUND_TYPE_EncoderMove,e_SOUND_TYPE_BlindAlert} eSOUND_TYPE;
-typedef enum
+typedef enum : uint8_t
      {e_SOUND_CLASS_Echo,e_SOUND_CLASS_Prompt,e_SOUND_CLASS_Confirm,e_SOUND_CLASS_Warning,e_SOUND_CLASS_Alert} eSOUND_CLASS;