diff --git a/const.hpp b/const.hpp
index 4b50b1f..50cc9c7 100644
--- a/const.hpp
+++ b/const.hpp
@@ -80,6 +80,7 @@
 constexpr auto mapperObjectPath = "/xyz/openbmc_project/object_mapper";
 constexpr auto mapperInterface = "xyz.openbmc_project.ObjectMapper";
 constexpr auto mapperDestination = "xyz.openbmc_project.ObjectMapper";
+constexpr auto loggerService = "xyz.openbmc_project.Logging";
 constexpr auto loggerObjectPath = "/xyz/openbmc_project/logging";
 constexpr auto loggerCreateInterface = "xyz.openbmc_project.Logging.Create";
 constexpr auto errIntfForBlankSystemVPD = "com.ibm.VPD.Error.BlankSystemVPD";
@@ -90,6 +91,7 @@
 constexpr auto errIntfForBusFailure = "com.ibm.VPD.Error.DbusFailure";
 constexpr auto errIntfForInvalidSystemType =
     "com.ibm.VPD.Error.UnknownSytemType";
+constexpr auto errIntfForEssentialFru = "com.ibm.VPD.Error.RequiredFRUMissing";
 constexpr auto errIntfForGpioError = "com.ibm.VPD.Error.GPIOError";
 constexpr auto motherBoardInterface =
     "xyz.openbmc_project.Inventory.Item.Board.Motherboard";