diff --git a/monitor/test/mock_power_interface.hpp b/monitor/test/mock_power_interface.hpp
index c070182..6801751 100644
--- a/monitor/test/mock_power_interface.hpp
+++ b/monitor/test/mock_power_interface.hpp
@@ -12,6 +12,7 @@
   public:
     MOCK_METHOD(void, softPowerOff, (), (override));
     MOCK_METHOD(void, hardPowerOff, (), (override));
+    MOCK_METHOD(void, thermalAlert, (bool), (override));
 };
 
 } // namespace phosphor::fan::monitor