diff --git a/main.h b/main.h
index 5b5bdf7d..8495cc54 100644
--- a/main.h
+++ b/main.h
@@ -124,6 +124,7 @@ long int uptime;
 char call[5];
 char sim_yes[10];
 int squelch = 3; // default squelch
+char rx[12], tx[12];
 
 int bitRate, mode, bufLen, rsFrames, payloads, rsFrameLen, dataLen, headerLen, syncBits, syncWord, parityLen, samples, frameCnt, samplePeriod;
 float sleepTime;