diff --git a/radio/src/targets/horus/CMakeLists.txt b/radio/src/targets/horus/CMakeLists.txt
index 14f35e6f9..490d4e06a 100644
--- a/radio/src/targets/horus/CMakeLists.txt
+++ b/radio/src/targets/horus/CMakeLists.txt
@@ -78,6 +78,7 @@ if (PCB STREQUAL X10)
     set(FLAVOUR x10express)
     set(DEFAULT_INTERNAL_MODULE ISRM_PXX2 CACHE STRING "Default internal module")
     set(BLUETOOTH ON)
+    set(AUX_SERIAL OFF)
     add_definitions(-DHARDWARE_POWER_MANAGEMENT_UNIT)
     add_definitions(-DRADIO_X10E)
     add_definitions(-DMANUFACTURER_FRSKY)
diff --git a/radio/src/targets/horus/board.cpp b/radio/src/targets/horus/board.cpp
index c7d081165..f939d2dd9 100644
--- a/radio/src/targets/horus/board.cpp
+++ b/radio/src/targets/horus/board.cpp
@@ -324,6 +324,7 @@ bool isBacklightEnabled()
   return boardBacklightOn;
 }
 
+#if defined(AUX_SERIAL_PWR_GPIO) || defined(AUX2_SERIAL_PWR_GPIO)
 static void _aux_pwr(GPIO_TypeDef *GPIOx, uint32_t pin, uint8_t on)
 {
   LL_GPIO_InitTypeDef pinInit;
@@ -339,6 +340,7 @@ static void _aux_pwr(GPIO_TypeDef *GPIOx, uint32_t pin, uint8_t on)
     LL_GPIO_ResetOutputPin(GPIOx, pin);
   }
 }
+#endif
 
 #if defined(AUX_SERIAL)
 void set_aux_pwr(uint8_t on)
diff --git a/radio/src/targets/horus/hal.h b/radio/src/targets/horus/hal.h
index 6f36a863a..d3e2fba01 100644
--- a/radio/src/targets/horus/hal.h
+++ b/radio/src/targets/horus/hal.h
@@ -412,7 +412,7 @@
 #endif
 
 // Serial Port (DEBUG)
-#if (defined(PCBX12S) || (defined(RADIO_FAMILY_T16)) && !defined(HARDWARE_EXTERNAL_ACCESS_MOD)) && !defined(IMU_LSM6DS33)
+#if defined(AUX_SERIAL)
   #define AUX_SERIAL_RCC_AHB1Periph           (RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB | RCC_AHB1Periph_DMA1)
   #define AUX_SERIAL_RCC_APB1Periph           RCC_APB1Periph_USART3
   #define AUX_SERIAL_RCC_APB2Periph           0
@@ -430,10 +430,10 @@
   #define AUX_SERIAL_DMA_Stream_RX            DMA1_Stream1
   #define AUX_SERIAL_DMA_Stream_RX_LL         LL_DMA_STREAM_1
   #define AUX_SERIAL_DMA_Channel_RX           DMA_Channel_4
-#if defined(RADIO_TX16S)
-  #define AUX_SERIAL_PWR_GPIO                 GPIOA
-  #define AUX_SERIAL_PWR_GPIO_PIN             GPIO_Pin_15  // PA.15
-#endif
+  #if defined(RADIO_TX16S)
+    #define AUX_SERIAL_PWR_GPIO                 GPIOA
+    #define AUX_SERIAL_PWR_GPIO_PIN             GPIO_Pin_15  // PA.15
+  #endif
 #else
   #define AUX_SERIAL_RCC_AHB1Periph           0
   #define AUX_SERIAL_RCC_APB1Periph           0