diff --git a/radio/src/CMakeLists.txt b/radio/src/CMakeLists.txt
index cba0c915d..f17b5252b 100644
--- a/radio/src/CMakeLists.txt
+++ b/radio/src/CMakeLists.txt
@@ -475,6 +475,7 @@ set(SRC
   trainer.cpp
   model_init.cpp
   serial.cpp
+  sbus.cpp
   )
 
 if(GUI)
diff --git a/radio/src/gui/gui_common.cpp b/radio/src/gui/gui_common.cpp
index 19b4b7ca2..f90a638dd 100644
--- a/radio/src/gui/gui_common.cpp
+++ b/radio/src/gui/gui_common.cpp
@@ -789,8 +789,13 @@ bool isTrainerModeAvailable(int mode)
   }
 #endif
 
-  if (mode == TRAINER_MODE_MASTER_SERIAL)
+  if (mode == TRAINER_MODE_MASTER_SERIAL) {
+#if defined(SBUS_TRAINER)
     return hasSerialMode(UART_MODE_SBUS_TRAINER) >= 0;
+#else
+    return false;
+#endif
+  }
 
   if ((mode == TRAINER_MODE_MASTER_BLUETOOTH ||
        mode == TRAINER_MODE_SLAVE_BLUETOOTH)
diff --git a/radio/src/targets/common/arm/CMakeLists.txt b/radio/src/targets/common/arm/CMakeLists.txt
index 27fa71251..9570d6a95 100644
--- a/radio/src/targets/common/arm/CMakeLists.txt
+++ b/radio/src/targets/common/arm/CMakeLists.txt
@@ -268,6 +268,7 @@ add_definitions(-g)
 add_definitions(-DCPUARM)
 add_definitions(-DGPS)
 add_definitions(-DBATTGRAPH -DTHRTRACE)
+add_definitions(-DSBUS_TRAINER)
 
 include_directories(${RTOS_DIR}/include)
 
diff --git a/radio/src/targets/horus/CMakeLists.txt b/radio/src/targets/horus/CMakeLists.txt
index 748745757..14f35e6f9 100644
--- a/radio/src/targets/horus/CMakeLists.txt
+++ b/radio/src/targets/horus/CMakeLists.txt
@@ -100,7 +100,6 @@ if (PCB STREQUAL X10)
     set(HARDWARE_TOUCH YES)
     set(USB_CHARGER YES)
     set(DEFAULT_THEME "DARKBLUE")
-    set(SBUS_TRAINER ON)
     add_definitions(-DMANUFACTURER_RADIOMASTER)
     if (NOT BLUETOOTH)
       set(AUX2_SERIAL ON)
@@ -244,14 +243,6 @@ if(BLUETOOTH)
   add_definitions(-DHARDWARE_TRAINER_BLUETOOTH)
 endif()
 
-if (SBUS_TRAINER)
-  add_definitions(-DSBUS_TRAINER)
-  set(SRC
-    ${SRC}
-    sbus.cpp
-    )
-endif()
-
 set(FIRMWARE_TARGET_SRC
   ${FIRMWARE_TARGET_SRC}
   ${LCD_DRIVER}
diff --git a/radio/src/targets/taranis/CMakeLists.txt b/radio/src/targets/taranis/CMakeLists.txt
index 564ba8a9b..ec404803a 100644
--- a/radio/src/targets/taranis/CMakeLists.txt
+++ b/radio/src/targets/taranis/CMakeLists.txt
@@ -505,7 +505,6 @@ endif()
 
 add_definitions(-DPCBTARANIS)
 add_definitions(-DAUDIO -DVOICE -DRTCLOCK)
-add_definitions(-DSBUS_TRAINER)
 
 set(SRC
   ${SRC}
@@ -530,11 +529,6 @@ if(STATUS_LEDS)
   set(LED_DRIVER led_driver.cpp)
 endif()
 
-set(SRC
-  ${SRC}
-  sbus.cpp
-  )
-
 set(FIRMWARE_TARGET_SRC
   ${FIRMWARE_TARGET_SRC}
   ${LED_DRIVER}
diff --git a/radio/src/trainer.cpp b/radio/src/trainer.cpp
index be7e568b0..caad8b088 100644
--- a/radio/src/trainer.cpp
+++ b/radio/src/trainer.cpp
@@ -61,9 +61,11 @@ void stopTrainer()
       stop_trainer_ppm();
       break;
 
+#if defined(SBUS_TRAINER)
     case TRAINER_MODE_MASTER_SERIAL:
       sbusSetGetByte(nullptr);
       break;
+#endif
 
 #if defined(TRAINER_MODULE_CPPM)
     case TRAINER_MODE_MASTER_CPPM_EXTERNAL_MODULE:
@@ -102,9 +104,11 @@ void checkTrainerSettings()
         init_trainer_ppm();
         break;
 
+#if defined(SBUS_TRAINER)
       case TRAINER_MODE_MASTER_SERIAL:
         sbusSetGetByte(sbusAuxGetByte);
         break;
+#endif
 
 #if defined(TRAINER_MODULE_CPPM)
       case TRAINER_MODE_MASTER_CPPM_EXTERNAL_MODULE: