Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -rac05209d7b6c65b22359754eced5ad2672d3092a -r6a414654391c1729525d55812abbf111ddef7d6a
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision ac05209d7b6c65b22359754eced5ad2672d3092a)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 6a414654391c1729525d55812abbf111ddef7d6a)
@@ -888,7 +888,7 @@
             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 );
                 }