diff --git a/matrix_keypad/RPi_GPIO.py b/matrix_keypad/RPi_GPIO.py
index ad8400f..117d064 100644
--- a/matrix_keypad/RPi_GPIO.py
+++ b/matrix_keypad/RPi_GPIO.py
@@ -71,8 +71,8 @@ def getKey(self):
             if tmpRead == 1:
                 colVal=j
                  
-        # if colVal is not 0 thru 2 then no button was pressed and we can exit
-        if colVal <0 or colVal >2:
+        # if colVal is not 0 thru 3 then no button was pressed and we can exit
+        if colVal <0 or colVal >3:
             self.exit()
             return