diff --git a/source/hazard/hpswitch.h b/source/hazard/hpswitch.h
index b88e02a0d..254c831f0 100644
--- a/source/hazard/hpswitch.h
+++ b/source/hazard/hpswitch.h
@@ -28,6 +28,7 @@ public:
 	void				init();
 	DVECTOR const		&getTriggerPos()										{return( m_triggerPos );}
 	void				linkToPlatform( CNpcTrapdoorPlatform *platform )		{m_platform = platform;}
+	bool				alwaysThink()											{return(true);}
 	//virtual void		render();
 protected:
 	virtual void		setWaypoints( sThingHazard *ThisHazard );