diff --git a/src/rx/crsf.h b/src/rx/crsf.h
index 60f111c15..67198280c 100644
--- a/src/rx/crsf.h
+++ b/src/rx/crsf.h
@@ -31,7 +31,7 @@
 
 #define CRSF_FRAME_SIZE_MAX 64
 #define CRSF_PAYLOAD_SIZE_MAX 60
-#define CRSF_MSP_PAYLOAD_SIZE_MAX (CRSF_PAYLOAD_SIZE_MAX - CRSF_FRAME_LENGTH_EXT_TYPE_CRC)
+#define CRSF_MSP_PAYLOAD_SIZE_MAX (CRSF_PAYLOAD_SIZE_MAX - CRSF_FRAME_LENGTH_TYPE_CRC)
 #define CRSF_SYNC_BYTE 0xC8
 
 #define CRSF_DEVICEINFO_VERSION 0x01