diff --git a/phosphor-regulators/src/vpd.hpp b/phosphor-regulators/src/vpd.hpp
index 3222d50..8ae1314 100644
--- a/phosphor-regulators/src/vpd.hpp
+++ b/phosphor-regulators/src/vpd.hpp
@@ -17,8 +17,10 @@
 
 #include <sdbusplus/bus.hpp>
 
+#include <cstdint>
 #include <map>
 #include <string>
+#include <vector>
 
 namespace phosphor::power::regulators
 {
@@ -60,8 +62,8 @@
      * @param keyword VPD keyword
      * @return VPD keyword value
      */
-    virtual std::string getValue(const std::string& inventoryPath,
-                                 const std::string& keyword) = 0;
+    virtual std::vector<uint8_t> getValue(const std::string& inventoryPath,
+                                          const std::string& keyword) = 0;
 };
 
 /**
@@ -96,14 +98,14 @@
     }
 
     /** @copydoc VPD::getValue() */
-    virtual std::string getValue(const std::string& inventoryPath,
-                                 const std::string& keyword) override;
+    virtual std::vector<uint8_t> getValue(const std::string& inventoryPath,
+                                          const std::string& keyword) override;
 
   private:
     /**
      * Type alias for map from keyword names to values.
      */
-    using KeywordMap = std::map<std::string, std::string>;
+    using KeywordMap = std::map<std::string, std::vector<uint8_t>>;
 
     /**
      * D-Bus bus object.