diff --git a/radio/src/targets/common/arm/stm32/board_common.h b/radio/src/targets/common/arm/stm32/board_common.h
index fa9b48f9c..2e9337191 100644
--- a/radio/src/targets/common/arm/stm32/board_common.h
+++ b/radio/src/targets/common/arm/stm32/board_common.h
@@ -151,7 +151,7 @@ void delay_ms(uint32_t count);
   #define ROTENC_HIGHSPEED             50
   #define ROTENC_DELAY_MIDSPEED        32
   #define ROTENC_DELAY_HIGHSPEED       16
-#elif defined(RADIO_T8)
+#elif defined(RADIO_T8) && defined(__cplusplus)
   constexpr uint8_t rotencSpeed = 1;
 #endif