Index: limitlessled_rf/__init__.py
==================================================================
--- limitlessled_rf/__init__.py
+++ limitlessled_rf/__init__.py
@@ -198,11 +198,11 @@
 		# Compute message body
 		body = [zone, button_id, message_id]
 
 		# Compute message trailer
 		## Include a CRC, for good measure ?
-		crc = 0
+		crc = len(header) + len(body) + 1
 		for byte in header + body:
 			crc = crc + byte
 		crc = crc & 0xff
 		trailer = [crc]