diff --git a/src/LoRa.cpp b/src/LoRa.cpp
index 78826df..84a8b82 100644
--- a/src/LoRa.cpp
+++ b/src/LoRa.cpp
@@ -111,7 +111,7 @@ void LoRaClass::end()
   SPI.end();
 }
 
-int LoRaClass::beginPacket(bool implicitHeader)
+int LoRaClass::beginPacket(int implicitHeader)
 {
   // put in standby mode
   idle();
diff --git a/src/LoRa.h b/src/LoRa.h
index 2cadc50..f5df68a 100644
--- a/src/LoRa.h
+++ b/src/LoRa.h
@@ -15,7 +15,7 @@ public:
   int begin(long frequency);
   void end();
 
-  int beginPacket(bool implicitHeader = false);
+  int beginPacket(int implicitHeader = false);
   int endPacket();
 
   int parsePacket(int size = 0);