diff --git a/chassis_state_manager.hpp b/chassis_state_manager.hpp
index d79464d..aece536 100644
--- a/chassis_state_manager.hpp
+++ b/chassis_state_manager.hpp
@@ -234,7 +234,7 @@
      *
      *  @return true if fault detected, else false
      */
-    bool standbyVoltageRegulatorFault();
+    static bool standbyVoltageRegulatorFault();
 
     /** @brief Process UPS property changes
      *