1 files changed, 8 insertions, 5 deletions
diff --git a/src/mbgl/renderer/sources/render_vector_source.cpp b/src/mbgl/renderer/sources/render_vector_source.cpp
index 0db4698a81..f88ca2beea 100644
--- a/src/mbgl/renderer/sources/render_vector_source.cpp
+++ b/src/mbgl/renderer/sources/render_vector_source.cpp
@@ -9,12 +9,15 @@ namespace mbgl {
 
 using namespace style;
 
-RenderVectorSource::RenderVectorSource(const style::VectorSource::Impl& impl_)
-    : RenderSource(impl_),
-      impl(impl_) {
+RenderVectorSource::RenderVectorSource(Immutable<style::VectorSource::Impl> impl_)
+    : RenderSource(impl_) {
     tilePyramid.setObserver(this);
 }
 
+const style::VectorSource::Impl& RenderVectorSource::impl() const {
+    return static_cast<const style::VectorSource::Impl&>(*baseImpl);
+}
+
 bool RenderVectorSource::isLoaded() const {
     return tilePyramid.isLoaded();
 }
@@ -37,7 +40,7 @@ std::map<UnwrappedTileID, RenderTile>& RenderVectorSource::getRenderTiles() {
 }
 
 void RenderVectorSource::updateTiles(const TileParameters& parameters) {
-    optional<Tileset> tileset = impl.getTileset();
+    optional<Tileset> tileset = impl().getTileset();
 
     if (!tileset) {
         return;
@@ -53,7 +56,7 @@ void RenderVectorSource::updateTiles(const TileParameters& parameters) {
                             util::tileSize,
                             tileset->zoomRange,
                             [&] (const OverscaledTileID& tileID) {
-                                return std::make_unique<VectorTile>(tileID, impl.id, parameters, *tileset);
+                                return std::make_unique<VectorTile>(tileID, impl().id, parameters, *tileset);
                             });
 }