diff --git a/devtimer.py b/devtimer.py
index aae0864..cc8a38b 100755
--- a/devtimer.py
+++ b/devtimer.py
@@ -17,9 +17,9 @@
 
 # Display
 
-BRIGHTNESS = 0x09
-CLK = 21
-DIO = 20
+BRIGHTNESS0 = 0x09
+CLK0 = 21
+DIO0 = 20
 
 # General Constants
 
@@ -97,7 +97,7 @@
 if __name__ == "__main__":
 
     wiringPiSetupGpio()
-    display0 = TM1637(CLK, DIO, BRIGHTNESS)
+    display0 = TM1637(CLK0, DIO0, BRIGHTNESS0)
 
     compensation_profile = 0
     elapsed_time = 0