diff --git a/panda/src/physics/linearControlForce.h b/panda/src/physics/linearControlForce.h
index a190e20e05..eb376cd197 100755
--- a/panda/src/physics/linearControlForce.h
+++ b/panda/src/physics/linearControlForce.h
@@ -37,6 +37,7 @@ PUBLISHED:
   LinearControlForce(const LinearControlForce &copy);
   virtual ~LinearControlForce();
 
+  INLINE void clear_physics_object();
   INLINE void set_physics_object(const PhysicsObject *po);
   INLINE CPT(PhysicsObject) get_physics_object() const;