Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -rcc8b9ddb9905161ddb0dc2af6bfbf863408669c8 -rdb5eeea50b6d69b626ce97f0f32377313385a009
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision cc8b9ddb9905161ddb0dc2af6bfbf863408669c8)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision db5eeea50b6d69b626ce97f0f32377313385a009)
@@ -620,7 +620,7 @@
             if ( message.crc == crc8( (U08*)(&message), sizeof(MESSAGE_HEADER_T) + message.msg.hdr.payloadLen ) )
             {
                 // if ACK, mark pending message ACK'd
-                if ( MSG_ID_ACK == message.msg.hdr.msgID )
+                if ( MSG_ID_ACK_MESSAGE_THAT_REQUIRES_ACK == message.msg.hdr.msgID )
                 {
                     matchACKtoPendingACKList( message.msg.hdr.seqNo );
                 }