diff --git a/src/newgrf_object.cpp b/src/newgrf_object.cpp
--- a/src/newgrf_object.cpp
+++ b/src/newgrf_object.cpp
@@ -133,7 +133,7 @@ INSTANTIATE_NEWGRF_CLASS_METHODS(ObjectC
  * @param tile %Tile of the object.
  * @param view View of the object.
  */
-ObjectScopeResolver::ObjectScopeResolver(ResolverObject *ro, Object *obj, TileIndex tile, uint8 view)
+ObjectScopeResolver::ObjectScopeResolver(ResolverObject &ro, Object *obj, TileIndex tile, uint8 view)
 		: ScopeResolver(ro)
 {
 	this->obj = obj;
@@ -326,7 +326,7 @@ static uint32 GetCountAndDistanceOfClose
 		case 0x48: return this->obj->view;
 
 		/* Get object ID at offset param */
-		case 0x60: return GetObjectIDAtOffset(GetNearbyTile(parameter, this->tile), this->ro->grffile->grfid);
+		case 0x60: return GetObjectIDAtOffset(GetNearbyTile(parameter, this->tile), this->ro.grffile->grfid);
 
 		/* Get random tile bits at offset param */
 		case 0x61: {
@@ -335,7 +335,7 @@ static uint32 GetCountAndDistanceOfClose
 		}
 
 		/* Land info of nearby tiles */
-		case 0x62: return GetNearbyObjectTileInformation(parameter, this->tile, this->obj == NULL ? INVALID_OBJECT : this->obj->index, this->ro->grffile->grf_version >= 8);
+		case 0x62: return GetNearbyObjectTileInformation(parameter, this->tile, this->obj == NULL ? INVALID_OBJECT : this->obj->index, this->ro.grffile->grf_version >= 8);
 
 		/* Animation counter of nearby tile */
 		case 0x63: {
@@ -344,7 +344,7 @@ static uint32 GetCountAndDistanceOfClose
 		}
 
 		/* Count of object, distance of closest instance */
-		case 0x64: return GetCountAndDistanceOfClosestInstance(parameter, this->ro->grffile->grfid, this->tile, this->obj);
+		case 0x64: return GetCountAndDistanceOfClosestInstance(parameter, this->ro.grffile->grfid, this->tile, this->obj);
 	}
 
 unhandled:
@@ -383,7 +383,7 @@ static const SpriteGroup *GetObjectSprit
  */
 ObjectResolverObject::ObjectResolverObject(const ObjectSpec *spec, Object *obj, TileIndex tile, uint8 view,
 		CallbackID callback, uint32 param1, uint32 param2)
-	: ResolverObject(spec->grf_prop.grffile, callback, param1, param2), object_scope(this, obj, tile, view)
+	: ResolverObject(spec->grf_prop.grffile, callback, param1, param2), object_scope(*this, obj, tile, view)
 {
 	this->town_scope = NULL;
 }
@@ -408,7 +408,7 @@ TownScopeResolver *ObjectResolverObject:
 			t = ClosestTownFromTile(this->object_scope.tile, UINT_MAX);
 		}
 		if (t == NULL) return NULL;
-		this->town_scope = new TownScopeResolver(this, t, this->object_scope.obj == NULL);
+		this->town_scope = new TownScopeResolver(*this, t, this->object_scope.obj == NULL);
 	}
 	return this->town_scope;
 }
@@ -427,7 +427,7 @@ TownScopeResolver *ObjectResolverObject:
 uint16 GetObjectCallback(CallbackID callback, uint32 param1, uint32 param2, const ObjectSpec *spec, Object *o, TileIndex tile, uint8 view)
 {
 	ObjectResolverObject object(spec, o, tile, view, callback, param1, param2);
-	const SpriteGroup *group = SpriteGroup::Resolve(GetObjectSpriteGroup(spec, o), &object);
+	const SpriteGroup *group = SpriteGroup::Resolve(GetObjectSpriteGroup(spec, o), object);
 	if (group == NULL) return CALLBACK_FAILED;
 
 	return group->GetCallbackResult();
@@ -470,7 +470,7 @@ void DrawNewObjectTile(TileInfo *ti, con
 	Object *o = Object::GetByTile(ti->tile);
 	ObjectResolverObject object(spec, o, ti->tile);
 
-	const SpriteGroup *group = SpriteGroup::Resolve(GetObjectSpriteGroup(spec, o), &object);
+	const SpriteGroup *group = SpriteGroup::Resolve(GetObjectSpriteGroup(spec, o), object);
 	if (group == NULL || group->type != SGT_TILELAYOUT) return;
 
 	DrawTileLayout(ti, (const TileLayoutSpriteGroup *)group, spec);
@@ -486,7 +486,7 @@ void DrawNewObjectTile(TileInfo *ti, con
 void DrawNewObjectTileInGUI(int x, int y, const ObjectSpec *spec, uint8 view)
 {
 	ObjectResolverObject object(spec, NULL, INVALID_TILE, view);
-	const SpriteGroup *group = SpriteGroup::Resolve(GetObjectSpriteGroup(spec, NULL), &object);
+	const SpriteGroup *group = SpriteGroup::Resolve(GetObjectSpriteGroup(spec, NULL), object);
 	if (group == NULL || group->type != SGT_TILELAYOUT) return;
 
 	const DrawTileSprites *dts = ((const TileLayoutSpriteGroup *)group)->ProcessRegisters(NULL);