1 files changed, 3 insertions, 2 deletions
diff --git a/src/mbgl/renderer/sources/render_vector_source.hpp b/src/mbgl/renderer/sources/render_vector_source.hpp
index 36d75e0982..b3704a1274 100644
--- a/src/mbgl/renderer/sources/render_vector_source.hpp
+++ b/src/mbgl/renderer/sources/render_vector_source.hpp
@@ -8,7 +8,7 @@ namespace mbgl {
 
 class RenderVectorSource : public RenderSource {
 public:
-    RenderVectorSource(const style::VectorSource::Impl&);
+    RenderVectorSource(Immutable<style::VectorSource::Impl>);
 
     bool isLoaded() const final;
 
@@ -47,7 +47,8 @@ public:
     void dumpDebugLogs() const final;
 
 private:
-    const style::VectorSource::Impl& impl;
+    const style::VectorSource::Impl& impl() const;
+
     TilePyramid tilePyramid;
     optional<std::vector<std::string>> tileURLTemplates;
 };