diff --git a/MFRC522_I2C.cpp b/MFRC522_I2C.cpp
index cda1f85..69b6c3c 100644
--- a/MFRC522_I2C.cpp
+++ b/MFRC522_I2C.cpp
@@ -20,7 +20,7 @@
  */
 MFRC522::MFRC522(	byte chipAddress,
 					byte resetPowerDownPin,	///< Arduino pin connected to MFRC522's reset and power down input (Pin 6, NRSTPD, active low)
-					TwoWire * TwoWireInstance
+					TwoWire & TwoWireInstance
 				) : _TwoWireInstance(TwoWireInstance) {
 	_chipAddress = chipAddress;
 	_resetPowerDownPin = resetPowerDownPin;