diff --git a/extensions/openpower-pels/data_interface.hpp b/extensions/openpower-pels/data_interface.hpp
index 09bcf59..9a48721 100644
--- a/extensions/openpower-pels/data_interface.hpp
+++ b/extensions/openpower-pels/data_interface.hpp
@@ -239,10 +239,7 @@
      *
      * @return std::vector<std::string> - The list of names
      */
-    virtual const std::vector<std::string>& getSystemNames() const
-    {
-        return _systemNames;
-    }
+    virtual std::vector<std::string> getSystemNames() const = 0;
 
     /**
      * @brief Fills in the placeholder 'Ufcs' in the passed in location
@@ -401,11 +398,6 @@
      * @brief The motherboard CCIN
      */
     std::string _motherboardCCIN;
-
-    /**
-     * @brief The compatible system names array
-     */
-    std::vector<std::string> _systemNames;
 };
 
 /**
@@ -492,6 +484,13 @@
         getLocationCode(const std::string& inventoryPath) const override;
 
     /**
+     * @brief Get the list of system type names the system is called.
+     *
+     * @return std::vector<std::string> - The list of names
+     */
+    std::vector<std::string> getSystemNames() const override;
+
+    /**
      * @brief Fills in the placeholder 'Ufcs' in the passed in location
      *        code with the machine feature code and serial number, which
      *        is needed to create a valid location code.