Index: firmware/App/Services/SystemComm.c
===================================================================
diff -u -r8defcfa32034c4068b733930c2e8b0989c55daba -rd756f33d33c00c6ed3adddb1a31a2bd03ac1327a
--- firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision 8defcfa32034c4068b733930c2e8b0989c55daba)
+++ firmware/App/Services/SystemComm.c	(.../SystemComm.c)	(revision d756f33d33c00c6ed3adddb1a31a2bd03ac1327a)
@@ -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 );
                 }