diff --git a/platform/default/src/mbgl/gl/headless_backend_osmesa.cpp b/platform/default/src/mbgl/gl/headless_backend_osmesa.cpp
index 0da1caf9a..75e5dc8ab 100644
--- a/platform/default/src/mbgl/gl/headless_backend_osmesa.cpp
+++ b/platform/default/src/mbgl/gl/headless_backend_osmesa.cpp
@@ -6,6 +6,7 @@
 #include <cassert>
 
 namespace mbgl {
+namespace gl {
 
 class OSMesaBackendImpl : public HeadlessBackend::Impl {
 public:
@@ -44,4 +45,5 @@ void HeadlessBackend::createImpl() {
     impl = std::make_unique<OSMesaBackendImpl>();
 }
 
+} // namespace gl
 } // namespace mbgl