diff --git a/src/mbgl/layout/symbol_projection.hpp b/src/mbgl/layout/symbol_projection.hpp
index 03e660b47..3699eee29 100644
--- a/src/mbgl/layout/symbol_projection.hpp
+++ b/src/mbgl/layout/symbol_projection.hpp
@@ -60,4 +60,9 @@ namespace mbgl {
                                                             const mat4& labelPlaneMatrix,
                                                             const bool returnTileDistance);
 
+    void hideGlyphs(std::size_t numGlyphs, gfx::VertexVector<gfx::Vertex<SymbolDynamicLayoutAttributes>>& dynamicVertices);
+    void addDynamicAttributes(const Point<float>& anchorPoint,
+                              const float angle,
+                              gfx::VertexVector<gfx::Vertex<SymbolDynamicLayoutAttributes>>& dynamicVertices);
+
 } // end namespace mbgl