diff --git a/radio/src/audio_arm.cpp b/radio/src/audio_arm.cpp
index a13255312..b2dae928c 100644
--- a/radio/src/audio_arm.cpp
+++ b/radio/src/audio_arm.cpp
@@ -147,7 +147,7 @@ const int16_t sineValues[] =
 };
 
 #if defined(SDCARD)
-const char * audioFilenames[] = {
+const char * const audioFilenames[] = {
   "tada",
   "thralert",
   "swalert",
@@ -278,7 +278,7 @@ void referenceSystemAudioFiles()
   sdAvailableSystemAudioFiles = availableAudioFiles;
 }
 
-const char * suffixes[] = { "-off", "-on" };
+const char * const suffixes[] = { "-off", "-on" };
 
 char * getModelAudioPath(char * path)
 {
diff --git a/radio/src/targets/taranis/audio_driver.cpp b/radio/src/targets/taranis/audio_driver.cpp
index 9c350b16a..3f4020e64 100644
--- a/radio/src/targets/taranis/audio_driver.cpp
+++ b/radio/src/targets/taranis/audio_driver.cpp
@@ -36,7 +36,7 @@
 
 #include "../../opentx.h"
 
-int dacIdle = 1;
+bool dacIdle = true;
 
 void setSampleRate(uint32_t frequency)
 {
@@ -96,7 +96,7 @@ void dacInit()
 bool dacQueue(AudioBuffer *buffer)
 {
   if (dacIdle) {
-    dacIdle = 0;
+    dacIdle = false;
     DMA1_Stream5->CR &= ~DMA_SxCR_EN ;                              // Disable DMA channel
     DMA1->HIFCR = DMA_HIFCR_CTCIF5 | DMA_HIFCR_CHTIF5 | DMA_HIFCR_CTEIF5 | DMA_HIFCR_CDMEIF5 | DMA_HIFCR_CFEIF5 ; // Write ones to clear bits
     DMA1_Stream5->M0AR = CONVERT_PTR_UINT(buffer->data);
@@ -163,7 +163,7 @@ extern "C" void DMA1_Stream5_IRQHandler()
     DAC->SR = DAC_SR_DMAUDR1;                      // Write 1 to clear flag
   }
   else {
-    dacIdle = 1;
+    dacIdle = true;
   }
 }
 #endif
diff --git a/radio/src/targets/taranis/audio_driver.h b/radio/src/targets/taranis/audio_driver.h
index e357e8627..ea277a8ed 100644
--- a/radio/src/targets/taranis/audio_driver.h
+++ b/radio/src/targets/taranis/audio_driver.h
@@ -44,8 +44,6 @@ void dacStop();
 
 extern void setSampleRate(uint32_t frequency);
 
-extern int dacIdle;
-
 #define VOLUME_LEVEL_MAX  23
 #define VOLUME_LEVEL_DEF  12
 static const int8_t volumeScale[VOLUME_LEVEL_MAX+1] =