diff --git a/src/main/common/maths.h b/src/main/common/maths.h
index a672fba3a1..61675514ee 100644
--- a/src/main/common/maths.h
+++ b/src/main/common/maths.h
@@ -135,4 +135,5 @@ static inline float constrainf(float amt, float low, float high)
         return amt;
 }
 uint16_t crc16_ccitt(uint16_t crc, unsigned char a);
+uint8_t crc8_dvb_s2(uint8_t crc, unsigned char a);