diff --git a/phosphor-power-supply/test/mock.hpp b/phosphor-power-supply/test/mock.hpp
index 0c64e00..c4c2c9d 100644
--- a/phosphor-power-supply/test/mock.hpp
+++ b/phosphor-power-supply/test/mock.hpp
@@ -17,6 +17,9 @@
 
     MOCK_METHOD(uint64_t, read, (const std::string& name, Type type),
                 (override));
+    MOCK_METHOD(void, writeBinary,
+                (const std::string& name, std::vector<uint8_t> data, Type type),
+                (override));
 };
 } // namespace pmbus