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)
         {
diff --git a/phosphor-power-supply/power_supply.hpp b/phosphor-power-supply/power_supply.hpp
index 320fb65..ec523ae 100644
--- a/phosphor-power-supply/power_supply.hpp
+++ b/phosphor-power-supply/power_supply.hpp
@@ -26,6 +26,7 @@
 // The D-Bus property name to update with the CCIN value.
 constexpr auto MODEL_PROP = "Model";
 constexpr auto PN_PROP = "PartNumber";
+constexpr auto SPARE_PN_PROP = "SparePartNumber";
 constexpr auto SN_PROP = "SerialNumber";
 constexpr auto VERSION_PROP = "Version";