diff --git a/include/dbus_utility.hpp b/include/dbus_utility.hpp
index 481b33d..0c80197 100644
--- a/include/dbus_utility.hpp
+++ b/include/dbus_utility.hpp
@@ -73,6 +73,15 @@
 using MapperGetSubTreeResponse =
     std::vector<std::pair<std::string, MapperServiceMap>>;
 
+using MapperGetObject =
+    std::vector<std::pair<std::string, std::vector<std::string>>>;
+
+using MapperGetAncestorsResponse = std::vector<
+    std::pair<std::string,
+              std::vector<std::pair<std::string, std::vector<std::string>>>>>;
+
+using MapperGetSubTreePathsResponse = std::vector<std::string>;
+
 inline void escapePathForDbus(std::string& path)
 {
     const std::regex reg("[^A-Za-z0-9_/]");
@@ -109,13 +118,10 @@
 template <typename Callback>
 inline void checkDbusPathExists(const std::string& path, Callback&& callback)
 {
-    using GetObjectType =
-        std::vector<std::pair<std::string, std::vector<std::string>>>;
-
     crow::connections::systemBus->async_method_call(
         [callback{std::forward<Callback>(callback)}](
             const boost::system::error_code ec,
-            const GetObjectType& objectNames) {
+            const dbus::utility::MapperGetObject& objectNames) {
             callback(!ec && !objectNames.empty());
         },
         "xyz.openbmc_project.ObjectMapper",