diff --git a/MFRC522.py b/MFRC522.py
index 441482a..d1ee8b6 100644
--- a/MFRC522.py
+++ b/MFRC522.py
@@ -130,7 +130,7 @@ class MFRC522:
   def __init__(self, dev='/dev/spidev0.0', spd=1000000):
     spi.openSPI(device=dev,speed=spd)
     GPIO.setmode(GPIO.BOARD)
-    GPIO.setup(NRSTPD, GPIO.OUT)
+    GPIO.setup(self.NRSTPD, GPIO.OUT)
     GPIO.output(self.NRSTPD, 1)
     self.MFRC522_Init()