diff --git a/src/can_bus.cpp b/src/can_bus.cpp
index f870201..529581b 100644
--- a/src/can_bus.cpp
+++ b/src/can_bus.cpp
@@ -152,7 +152,7 @@ namespace sta {
 			// This is a weak function that can be overridden by the user, 
 			// if they want to handle system messages in a different way, i.e. ignore them
 
-			if(header.sid == 0x0){
+			if(header.sid == STA_TACOS_CAN_BUS_SYS_MSG_ID){
 				STA_ASSERT(header.payloadLength == 2);
 
 				// First byte of payload is the origin state, second byte is the destination state. Transition is forced