diff --git a/src/hm/Communication.h b/src/hm/Communication.h
index ae97dbb2..132faeb8 100644
--- a/src/hm/Communication.h
+++ b/src/hm/Communication.h
@@ -138,8 +138,10 @@ class Communication : public CommQueue<> {
                         }
                         if(!q->iv->mGotFragment) {
                             if(INV_RADIO_TYPE_CMT == q->iv->ivRadioType) {
+                                #if defined(ESP32)
                                 q->iv->radio->switchFrequency(q->iv, q->iv->radio->getBootFreqMhz() * 1000, (q->iv->config->frequency*FREQ_STEP_KHZ + q->iv->radio->getBaseFreqMhz() * 1000));
                                 mWaitTime.startTimeMonitor(1000);
+                                #endif
                             } else {
                                 if(IV_MI == q->iv->ivGen)
                                     q->iv->mIvTxCnt++;