diff --git a/buffet/dbus_utils.cc b/buffet/dbus_utils.cc
index 673afe3..4924ef5 100644
--- a/buffet/dbus_utils.cc
+++ b/buffet/dbus_utils.cc
@@ -37,6 +37,22 @@
   return scoped_ptr<dbus::Response>(resp.release());
 }
 
+scoped_ptr<dbus::Response> GetDBusError(dbus::MethodCall* method_call,
+                                        const chromeos::Error* error) {
+  std::string message;
+  while (error) {
+    // Format error string as "domain/code:message".
+    if (!message.empty())
+      message += ';';
+    message += error->GetDomain() + '/' + error->GetCode() + ':' +
+               error->GetMessage();
+    error = error->GetInnerError();
+  }
+  scoped_ptr<dbus::ErrorResponse> resp(dbus::ErrorResponse::FromMethodCall(
+    method_call, "org.freedesktop.DBus.Error.Failed", message));
+  return scoped_ptr<dbus::Response>(resp.release());
+}
+
 dbus::ExportedObject::MethodCallCallback GetExportableDBusMethod(
     base::Callback<scoped_ptr<dbus::Response>(dbus::MethodCall*)> handler) {
   return base::Bind(&HandleSynchronousDBusMethodCall, handler);