diff --git a/radio/src/targets/common/arm/stm32/aux_serial_driver.cpp b/radio/src/targets/common/arm/stm32/aux_serial_driver.cpp
index a04c16ed8..a3524c47a 100644
--- a/radio/src/targets/common/arm/stm32/aux_serial_driver.cpp
+++ b/radio/src/targets/common/arm/stm32/aux_serial_driver.cpp
@@ -159,11 +159,7 @@ void auxSerialInit(unsigned int mode, unsigned int protocol)
 void auxSerialPutc(char c)
 {
 #if !defined(SIMU)
-  int n = 0;
-  while (auxSerialTxFifo.isFull()) {
-    delay_ms(1);
-    if (++n > 100) return;
-  }
+  if (auxSerialTxFifo.isFull()) return;
   auxSerialTxFifo.push(c);
   USART_ITConfig(AUX_SERIAL_USART, USART_IT_TXE, ENABLE);
 #endif
@@ -357,11 +353,7 @@ void aux2SerialInit(unsigned int mode, unsigned int protocol)
 void aux2SerialPutc(char c)
 {
 #if !defined(SIMU)
-  int n = 0;
-  while (aux2SerialTxFifo.isFull()) {
-    delay_ms(1);
-    if (++n > 100) return;
-  }
+  if (aux2SerialTxFifo.isFull()) return;
   aux2SerialTxFifo.push(c);
   USART_ITConfig(AUX2_SERIAL_USART, USART_IT_TXE, ENABLE);
 #endif
diff --git a/radio/src/targets/horus/board.h b/radio/src/targets/horus/board.h
index b248791a1..8150ed589 100644
--- a/radio/src/targets/horus/board.h
+++ b/radio/src/targets/horus/board.h
@@ -641,7 +641,7 @@ void sportUpdatePowerInit();
   #define DEBUG_BAUDRATE                  115200
   #define LUA_DEFAULT_BAUDRATE            115200
 #endif
-#if defined(AUX_SERIAL_GPIO)
+#if defined(AUX_SERIAL)
 extern uint8_t auxSerialMode;
 #if defined __cplusplus
 void auxSerialSetup(unsigned int baudrate, bool dma, uint16_t length = USART_WordLength_8b, uint16_t parity = USART_Parity_No, uint16_t stop = USART_StopBits_1);