diff --git a/src/main/main.c b/src/main/main.c
index a7d0d3153..41e3c9ba0 100755
--- a/src/main/main.c
+++ b/src/main/main.c
@@ -262,7 +262,7 @@ void init(void)
         pwm_params.airplane = true;
     else
         pwm_params.airplane = false;
-#ifdef STM32F10X
+#if defined(SERIAL_PORT_USART2) && defined(STM32F10X)
     pwm_params.useUART2 = doesConfigurationUsePort(SERIAL_PORT_USART2);
 #endif
     pwm_params.useVbat = feature(FEATURE_VBAT);