1 files changed, 5 insertions, 8 deletions
diff --git a/include/mbgl/storage/resource_transform.hpp b/include/mbgl/storage/resource_transform.hpp
index b8e3dbac76..29d19bb4ec 100644
--- a/include/mbgl/storage/resource_transform.hpp
+++ b/include/mbgl/storage/resource_transform.hpp
@@ -1,6 +1,5 @@
 #pragma once
 
-#include <mbgl/actor/actor_ref.hpp>
 #include <mbgl/storage/resource.hpp>
 
 #include <functional>
@@ -8,16 +7,14 @@
 
 namespace mbgl {
 
-class Mailbox;
-
 class ResourceTransform {
 public:
-    using TransformCallback = std::function<std::string(Resource::Kind kind, const std::string& url)>;
-    using FinishedCallback = std::function<void(const std::string&&)>;
-
-    ResourceTransform(ActorRef<ResourceTransform>, TransformCallback&&);
+    using FinishedCallback = std::function<void(const std::string&)>;
+    using TransformCallback = std::function<void(Resource::Kind kind, const std::string& url, FinishedCallback)>;
 
-    void transform(Resource::Kind, const std::string& url, FinishedCallback&&);
+    ResourceTransform(TransformCallback = {});
+    void transform(Resource::Kind, const std::string& url, FinishedCallback);
+    explicit operator bool() const { return bool(transformCallback); }
 
 private:
     TransformCallback transformCallback;