diff --git a/include/mbgl/map/vector_tile_data.hpp b/include/mbgl/map/vector_tile_data.hpp
index d31d11499..edad22899 100644
--- a/include/mbgl/map/vector_tile_data.hpp
+++ b/include/mbgl/map/vector_tile_data.hpp
@@ -51,6 +51,9 @@ protected:
     std::unordered_map<std::string, std::unique_ptr<Bucket>> buckets;
 
     std::unique_ptr<TileParser> parser;
+
+public:
+    const float depth;
 };
 
 }
diff --git a/src/map/tile_parser.cpp b/src/map/tile_parser.cpp
index 89ca4a41f..97b071a16 100644
--- a/src/map/tile_parser.cpp
+++ b/src/map/tile_parser.cpp
@@ -43,7 +43,7 @@ TileParser::TileParser(const std::string &data, VectorTileData &tile,
       glyphStore(glyphStore),
       spriteAtlas(spriteAtlas),
       sprite(sprite),
-      collision(tile.id.z, 4096, tile.source.tile_size, tile.id.z >= tile.source.max_zoom ? tile.source.max_zoom - tile.id.z : 1) {
+      collision(tile.id.z, 4096, tile.source.tile_size, tile.depth) {
 }
 
 void TileParser::parse() {
diff --git a/src/map/vector_tile_data.cpp b/src/map/vector_tile_data.cpp
index cc4133e45..2bf339b65 100644
--- a/src/map/vector_tile_data.cpp
+++ b/src/map/vector_tile_data.cpp
@@ -9,7 +9,8 @@
 using namespace mbgl;
 
 VectorTileData::VectorTileData(Tile::ID id, Map &map, const SourceInfo &source)
-    : TileData(id, map, source) {
+    : TileData(id, map, source),
+      depth(id.z >= source.max_zoom ? map.getMaxZoom() - id.z : 1) {
 }
 
 VectorTileData::~VectorTileData() {