diff --git a/crossbow/lora.cpp b/crossbow/lora.cpp
index 76e31a3..c6e8c21 100644
--- a/crossbow/lora.cpp
+++ b/crossbow/lora.cpp
@@ -286,6 +286,8 @@ void LoRaClass::onReceive(void(*callback)(int))
   _onReceive = callback;
 
   if (callback) {
+    pinMode(_dio0, INPUT);
+    
     writeRegister(REG_DIO_MAPPING_1, 0x00);
 
     attachInterrupt(digitalPinToInterrupt(_dio0), LoRaClass::onDio0Rise, RISING);