diff --git a/src/protocols/LoRaWAN/LoRaWAN.cpp b/src/protocols/LoRaWAN/LoRaWAN.cpp
index 0c36377d..75266256 100644
--- a/src/protocols/LoRaWAN/LoRaWAN.cpp
+++ b/src/protocols/LoRaWAN/LoRaWAN.cpp
@@ -778,6 +778,7 @@ bool LoRaWANNode::verifyMIC(uint8_t* msg, size_t len, uint8_t* key) {
   // calculate the expected value and compare
   uint32_t micCalculated = generateMIC(msg, len - sizeof(uint32_t), key);
   if(micCalculated != micReceived) {
+    RADIOLIB_DEBUG_PRINTLN("MIC mismatch, expected %08x, got %08x", micCalculated, micReceived);
     return(false);
   }