diff --git a/syspwm.py b/syspwm.py
index 2272681..dbf8f05 100644
--- a/syspwm.py
+++ b/syspwm.py
@@ -101,11 +101,11 @@ def set_frequency(self,hz):
 
 	while True:
 		pwm.set_duty_cycle(S)
-		print 0
+		print(0)
 		sleep(SLEE)
 		pwm.set_duty_cycle(M)
-		print 90
+		print(90)
 		sleep(SLEE)
 		pwm.set_duty_cycle(E)
-		print 180
+		print(180)
 		sleep(SLEE)