diff --git a/src/audio_arm.h b/src/audio_arm.h
index 7f190dbb9..32e5c73d6 100644
--- a/src/audio_arm.h
+++ b/src/audio_arm.h
@@ -222,4 +222,9 @@ extern void refreshSystemAudioFiles();
 extern void refreshModelAudioFiles();
 extern bool isAudioFileAvailable(uint32_t i, char * filename);
 
+// TODO not public, everything could be inside a function in audio_arm.cpp
+extern OS_TCID audioTimer;
+extern OS_FlagID audioFlag;
+extern OS_MutexID audioMutex;
+
 #endif
diff --git a/src/taranis/sport_driver.cpp b/src/taranis/sport_driver.cpp
index fa4fc76e7..8422082e1 100644
--- a/src/taranis/sport_driver.cpp
+++ b/src/taranis/sport_driver.cpp
@@ -85,6 +85,8 @@ void sportPutc(const char c)
   GPIO_ResetBits(GPIO_PIN_SPORT_ON, PIN_SPORT_ON);
 }
 
+void processSerialData(uint8_t data);
+
 #if !defined(SIMU)
 extern "C" void USART2_IRQHandler()
 {