diff --git a/src/drivers/drv_serial_vtx_sa.c b/src/drivers/drv_serial_vtx_sa.c
index 51731001b..388283644 100644
--- a/src/drivers/drv_serial_vtx_sa.c
+++ b/src/drivers/drv_serial_vtx_sa.c
@@ -380,13 +380,13 @@ void serial_smart_audio_send_payload(uint8_t cmd, const uint8_t *payload, const
   vtx_last_valid_read = time_millis();
 }
 
-int8_t smart_audio_dac_power_level_index(uint8_t dac) {
+uint8_t smart_audio_dac_power_level_index(uint8_t dac) {
   for (uint8_t level = 0; level < 4; level++) {
     if (dac == smart_audio_settings.dac_power_levels[level]) {
       return level;
     }
   }
-  return -1;
+  return 0;
 }
 
 #endif
diff --git a/src/drivers/drv_serial_vtx_sa.h b/src/drivers/drv_serial_vtx_sa.h
index aa99c8c98..e7695d323 100644
--- a/src/drivers/drv_serial_vtx_sa.h
+++ b/src/drivers/drv_serial_vtx_sa.h
@@ -34,4 +34,4 @@ typedef struct {
 void serial_smart_audio_init();
 vtx_update_result_t serial_smart_audio_update();
 void serial_smart_audio_send_payload(uint8_t cmd, const uint8_t *payload, const uint32_t size);
-int8_t smart_audio_dac_power_level_index(uint8_t dac);
\ No newline at end of file
+uint8_t smart_audio_dac_power_level_index(uint8_t dac);
\ No newline at end of file
diff --git a/src/main/vtx.c b/src/main/vtx.c
index d14a8e747..fb62dedde 100644
--- a/src/main/vtx.c
+++ b/src/main/vtx.c
@@ -191,13 +191,13 @@ const uint16_t tramp_power_level[4] = {
     400,
 };
 
-int8_t tramp_power_level_index(uint16_t power) {
+vtx_power_level_t tramp_power_level_index(uint16_t power) {
   for (uint8_t level = 0; level < VTX_POWER_LEVEL_MAX; level++) {
     if (power >= tramp_power_level[level] && power <= tramp_power_level[level]) {
       return level;
     }
   }
-  return -1;
+  return VTX_POWER_LEVEL_1;
 }
 
 vtx_detect_status_t vtx_tramp_update(vtx_settings_t *actual) {