1 files changed, 2 insertions, 2 deletions
diff --git a/platform/default/include/mbgl/gfx/headless_frontend.hpp b/platform/default/include/mbgl/gfx/headless_frontend.hpp
index 8a98b4112d..9b079f9333 100644
--- a/platform/default/include/mbgl/gfx/headless_frontend.hpp
+++ b/platform/default/include/mbgl/gfx/headless_frontend.hpp
@@ -26,12 +26,12 @@ public:
     HeadlessFrontend(float pixelRatio_,
                      gfx::HeadlessBackend::SwapBehaviour swapBehviour = gfx::HeadlessBackend::SwapBehaviour::NoFlush,
                      gfx::ContextMode mode = gfx::ContextMode::Unique,
-                     const optional<std::string> localFontFamily = {});
+                     const optional<std::string>& localFontFamily = {});
     HeadlessFrontend(Size,
                      float pixelRatio_,
                      gfx::HeadlessBackend::SwapBehaviour swapBehviour = gfx::HeadlessBackend::SwapBehaviour::NoFlush,
                      gfx::ContextMode mode = gfx::ContextMode::Unique,
-                     const optional<std::string> localFontFamily = {});
+                     const optional<std::string>& localFontFamily = {});
     ~HeadlessFrontend() override;
 
     void reset() override;