diff --git a/Code/Server/Motor.py b/Code/Server/Motor.py
index 9a0f602f..730c19a4 100644
--- a/Code/Server/Motor.py
+++ b/Code/Server/Motor.py
@@ -24,7 +24,7 @@ def duty_range(self,duty1,duty2,duty3,duty4):
             duty4=4095
         elif duty4<-4095:
             duty4=-4095
-        return duty1,duty2,duty3,duty4
+        return -duty1,-duty2,-duty3,-duty4
         
     def left_Upper_Wheel(self,duty):
         if duty>0: