diff --git a/phosphor-power-supply/power_supply.cpp b/phosphor-power-supply/power_supply.cpp
index ea0d172..908f04f 100644
--- a/phosphor-power-supply/power_supply.cpp
+++ b/phosphor-power-supply/power_supply.cpp
@@ -592,6 +592,7 @@
         try
         {
             fn = pmbusIntf->readString(FRU_NUMBER, Type::HwmonDeviceDebug);
+            assetProps.emplace(SPARE_PN_PROP, fn);
         }
         catch (const ReadFailure& e)
         {