diff --git a/source/hazard/hbwheel.cpp b/source/hazard/hbwheel.cpp
index 1a76b793b..dfa853434 100644
--- a/source/hazard/hbwheel.cpp
+++ b/source/hazard/hbwheel.cpp
@@ -71,3 +71,18 @@ void CNpcBigWheelHazard::collidedWith( CThing *_thisThing )
 {
 	// do not collide
 }
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+const CRECT *CNpcBigWheelHazard::getThinkBBox()
+{
+	CRECT objThinkBox = getCollisionArea();
+
+	sBBox &thinkBBox = CThingManager::getThinkBBox();
+	objThinkBox.x1 = thinkBBox.XMin;
+	objThinkBox.x2 = thinkBBox.XMax;
+	objThinkBox.y1 = thinkBBox.YMin;
+	objThinkBox.y2 = thinkBBox.YMax;
+
+	return &objThinkBox;
+}
\ No newline at end of file
diff --git a/source/hazard/hbwheel.h b/source/hazard/hbwheel.h
index dba5b1ebe..bb6944704 100644
--- a/source/hazard/hbwheel.h
+++ b/source/hazard/hbwheel.h
@@ -23,6 +23,7 @@ class CNpcBigWheelHazard : public CNpcHazard
 public:
 	void				init();
 	virtual void		render();
+	virtual	CRECT const		*getThinkBBox();
 protected:
 	void				processMovement( int _frames );
 	virtual void		collidedWith(CThing *_thisThing);
diff --git a/source/platform/pbwheel.cpp b/source/platform/pbwheel.cpp
index a797c35bc..1cffc7766 100644
--- a/source/platform/pbwheel.cpp
+++ b/source/platform/pbwheel.cpp
@@ -76,3 +76,18 @@ void CNpcBigWheelPlatform::setWaypoints( sThingPlatform *ThisPlatform )
 		init( startPos );
 	}
 }
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+const CRECT *CNpcBigWheelPlatform::getThinkBBox()
+{
+	CRECT objThinkBox = getCollisionArea();
+
+	sBBox &thinkBBox = CThingManager::getThinkBBox();
+	objThinkBox.x1 = thinkBBox.XMin;
+	objThinkBox.x2 = thinkBBox.XMax;
+	objThinkBox.y1 = thinkBBox.YMin;
+	objThinkBox.y2 = thinkBBox.YMax;
+
+	return &objThinkBox;
+}
\ No newline at end of file
diff --git a/source/platform/pbwheel.h b/source/platform/pbwheel.h
index 376d59d60..da84c1707 100644
--- a/source/platform/pbwheel.h
+++ b/source/platform/pbwheel.h
@@ -20,6 +20,8 @@
 
 class CNpcBigWheelPlatform : public CNpcPlatform
 {
+public:
+	virtual	CRECT const		*getThinkBBox();
 protected:
 	virtual void		setWaypoints( sThingPlatform *ThisPlatform );
 	virtual void		processMovement( int _frames );