diff --git a/include/google/google_service_root.hpp b/include/google/google_service_root.hpp
index b43a8a5..c59cbab 100644
--- a/include/google/google_service_root.hpp
+++ b/include/google/google_service_root.hpp
@@ -50,7 +50,7 @@
     std::string id;
     std::string service;
     std::string object;
-    const char* interface;
+    std::string interface;
 };
 
 using ResolvedEntityHandler = std::function<void(