diff --git a/src/app/PowerManager.h b/src/app/PowerManager.h
index f90920b..3ec5e23 100644
--- a/src/app/PowerManager.h
+++ b/src/app/PowerManager.h
@@ -1,5 +1,5 @@
-#ifndef POWERMANAGER
-#define POWERMANAGER
+#ifndef POWERMANAGER_H
+#define POWERMANAGER_H
 
 #include "Arduino.h"
 #include "definition.h"