diff --git a/JointOrientationBasics-Unity/Assets/JointOrientationBasics/Scripts/DoubleExponentialFilter.cs b/JointOrientationBasics-Unity/Assets/JointOrientationBasics/Scripts/DoubleExponentialFilter.cs
index affc733..ceae110 100644
--- a/JointOrientationBasics-Unity/Assets/JointOrientationBasics/Scripts/DoubleExponentialFilter.cs
+++ b/JointOrientationBasics-Unity/Assets/JointOrientationBasics/Scripts/DoubleExponentialFilter.cs
@@ -316,11 +316,11 @@ public Joint GetFilteredJoint(Kinect.JointType jt)
         private bool JointPositionIsValid(Joint joint)
         {
             // if joint is 0 it is not valid.
-            bool posIsValid = joint.Position.Equals(Vector3.zero);
+            bool posIsValid = !joint.Position.Equals(Vector3.zero);
             //bool orientationIsValid = joint.Rotation.Equals(Helpers.QuaternionZero);
             bool orientationIsValid = true;
 
             return posIsValid && orientationIsValid;
         }
     }
-}
\ No newline at end of file
+}