diff --git a/src/protocols/LoRaWAN/LoRaWAN.cpp b/src/protocols/LoRaWAN/LoRaWAN.cpp
index 476eb326..02c200a7 100644
--- a/src/protocols/LoRaWAN/LoRaWAN.cpp
+++ b/src/protocols/LoRaWAN/LoRaWAN.cpp
@@ -36,6 +36,7 @@ LoRaWANNode::LoRaWANNode(PhysicalLayer* phy, const LoRaWANBand_t* band, uint8_t
   this->difsSlots = 2;
   this->backoffMax = 6;
   this->enableCSMA = false;
+  memset(this->availableChannels, 0, sizeof(this->availableChannels));
 }
 
 void LoRaWANNode::setCSMA(uint8_t backoffMax, uint8_t difsSlots, bool enableCSMA) {
diff --git a/src/protocols/LoRaWAN/LoRaWAN.h b/src/protocols/LoRaWAN/LoRaWAN.h
index 7da55651..fd75da52 100644
--- a/src/protocols/LoRaWAN/LoRaWAN.h
+++ b/src/protocols/LoRaWAN/LoRaWAN.h
@@ -954,7 +954,7 @@ class LoRaWANNode {
     uint8_t difsSlots;
 
     // available channel frequencies from list passed during OTA activation
-    LoRaWANChannel_t availableChannels[2][RADIOLIB_LORAWAN_NUM_AVAILABLE_CHANNELS] = { { 0 }, { 0 } };
+    LoRaWANChannel_t availableChannels[2][RADIOLIB_LORAWAN_NUM_AVAILABLE_CHANNELS];
 
     // currently configured channels for TX and RX1
     LoRaWANChannel_t currentChannels[2] = { RADIOLIB_LORAWAN_CHANNEL_NONE, RADIOLIB_LORAWAN_CHANNEL_NONE };