diff --git a/lib/Hoymiles/src/HoymilesRadio.cpp b/lib/Hoymiles/src/HoymilesRadio.cpp
index 53a8d79..dbd6515 100644
--- a/lib/Hoymiles/src/HoymilesRadio.cpp
+++ b/lib/Hoymiles/src/HoymilesRadio.cpp
@@ -155,14 +155,14 @@ void ARDUINO_ISR_ATTR HoymilesRadio::handleIntr()
 
 uint8_t HoymilesRadio::getRxNxtChannel()
 {
-    if (++_rxChIdx >= 4)
+    if (++_rxChIdx >= sizeof(_rxChLst))
         _rxChIdx = 0;
     return _rxChLst[_rxChIdx];
 }
 
 uint8_t HoymilesRadio::getTxNxtChannel()
 {
-    if (++_txChIdx >= 1)
+    if (++_txChIdx >= sizeof(_txChLst))
         _txChIdx = 0;
     return _txChLst[_txChIdx];
 }
diff --git a/lib/Hoymiles/src/HoymilesRadio.h b/lib/Hoymiles/src/HoymilesRadio.h
index 18e5a0e..8e883a4 100644
--- a/lib/Hoymiles/src/HoymilesRadio.h
+++ b/lib/Hoymiles/src/HoymilesRadio.h
@@ -11,8 +11,6 @@
 // number of fragments hold in buffer
 #define FRAGMENT_BUFFER_SIZE 30
 
-
-
 class HoymilesRadio {
 public:
     void init();
@@ -42,7 +40,7 @@ private:
     void u32CpyLittleEndian(uint8_t dest[], uint32_t src);
 
     std::unique_ptr<RF24> _radio;
-    uint8_t _rxChLst[4] = { 3, 23, 61, 75 };
+    uint8_t _rxChLst[5] = { 3, 23, 40, 61, 75 };
     uint8_t _rxChIdx;
 
     uint8_t _txChLst[1] = { 40 };