diff --git a/script/RobotSC.py b/script/RobotSC.py
index af6bf1f..9ffdc46 100644
--- a/script/RobotSC.py
+++ b/script/RobotSC.py
@@ -46,7 +46,7 @@ class jfc(ReadonlyRegisterBase):
     def doRead(self):
         if robot.joint_forces == None:
             return  None 
-        if not robot.powered:
+        if robot.powered == False:
             return None
         return (robot.joint_forces[1]+74)/4  + (robot.joint_forces[2]+30)/4 + (robot.joint_forces[4]-0.8)/0.2