diff --git a/src/Thing.cs b/src/Thing.cs
index a231304..03b11f5 100644
--- a/src/Thing.cs
+++ b/src/Thing.cs
@@ -421,7 +421,7 @@ namespace RoboidControl {
             this.orientationUpdated = false;
             this.linearVelocityUpdated = false;
             this.angularVelocityUpdated = false;
-            //this.hierarchyChanged = false;
+            this.hierarchyChanged = false;
 
             // should recurse over children...
             if (recurse) {