diff --git a/extensions/openpower-pels/data_interface.hpp b/extensions/openpower-pels/data_interface.hpp
index 34bb173..14acd70 100644
--- a/extensions/openpower-pels/data_interface.hpp
+++ b/extensions/openpower-pels/data_interface.hpp
@@ -19,8 +19,8 @@
 /**
  * @class DataInterface
  *
- * An abstract interface class for gathering data about the system
- * for use in PELs. Implemented this way to facilitate mocking.
+ * A base class for gathering data about the system for use
+ * in PELs. Implemented this way to facilitate mocking.
  */
 class DataInterfaceBase
 {
@@ -33,18 +33,35 @@
     DataInterfaceBase& operator=(DataInterfaceBase&&) = default;
 
     /**
-     * @brief Pure virtual for returning the MTM
+     * @brief Returns the machine Type/Model
      *
      * @return string - The machine Type/Model string
      */
-    virtual std::string getMachineTypeModel() const = 0;
+    virtual std::string getMachineTypeModel() const
+    {
+        return _machineTypeModel;
+    }
 
     /**
-     * @brief Pure virtual for returning the machine SN
+     * @brief Returns the machine serial number
      *
      * @return string - The machine serial number
      */
-    virtual std::string getMachineSerialNumber() const = 0;
+    virtual std::string getMachineSerialNumber() const
+    {
+        return _machineSerialNumber;
+    }
+
+  protected:
+    /**
+     * @brief The machine type-model.  Always kept up to date
+     */
+    std::string _machineTypeModel;
+
+    /**
+     * @brief The machine serial number.  Always kept up to date
+     */
+    std::string _machineSerialNumber;
 };
 
 /**
@@ -69,26 +86,6 @@
      */
     explicit DataInterface(sdbusplus::bus::bus& bus);
 
-    /**
-     * @brief Returns the machine type/model value
-     *
-     * @return string - The machine Type/Model string
-     */
-    std::string getMachineTypeModel() const override
-    {
-        return _machineTypeModel;
-    }
-
-    /**
-     * @brief Returns the machine SN
-     *
-     * @return string - The machine serial number
-     */
-    std::string getMachineSerialNumber() const override
-    {
-        return _machineSerialNumber;
-    }
-
   private:
     /**
      * @brief Reads the machine type/model and SN from D-Bus.
@@ -131,16 +128,6 @@
     void sysAssetPropChanged(sdbusplus::message::message& msg);
 
     /**
-     * @brief The machine type-model.  Always kept up to date
-     */
-    std::string _machineTypeModel;
-
-    /**
-     * @brief The machine serial number.  Always kept up to date
-     */
-    std::string _machineSerialNumber;
-
-    /**
      * @brief The match object for the system path's properties
      */
     std::unique_ptr<sdbusplus::bus::match_t> _sysInventoryPropMatch;