diff --git a/src/MFRC522.h b/src/MFRC522.h
index 6a3a54f..a08df7b 100644
--- a/src/MFRC522.h
+++ b/src/MFRC522.h
@@ -330,11 +330,10 @@ public:
 	/////////////////////////////////////////////////////////////////////////////////////
 	// Functions for setting up the Arduino
 	/////////////////////////////////////////////////////////////////////////////////////
-	MFRC522(const byte chipSelectPin, const byte resetPowerDownPin,
-			SPIClass *spiClass = &SPI, const SPISettings spiSettings = SPISettings(SPI_CLOCK_DIV4, MSBFIRST, SPI_MODE0))
-			: _chipSelectPin(chipSelectPin), _resetPowerDownPin(resetPowerDownPin),
-			  _spiClass(spiClass), _spiSettings(spiSettings) {};
-	MFRC522() : MFRC522(UNUSED_PIN, UNUSED_PIN) {};
+	MFRC522(SPIClass *spiClass = &SPI, const SPISettings spiSettings = SPISettings(SPI_CLOCK_DIV4, MSBFIRST, SPI_MODE0))
+			: _spiClass(spiClass), _spiSettings(spiSettings), _chipSelectPin(UNUSED_PIN), _resetPowerDownPin(UNUSED_PIN) {};
+	MFRC522(byte chipSelectPin, byte resetPowerDownPin)
+			: _chipSelectPin(chipSelectPin), _resetPowerDownPin(resetPowerDownPin) { MFRC522(); };
 	
 	/////////////////////////////////////////////////////////////////////////////////////
 	// Basic interface functions for communicating with the MFRC522