diff --git a/sysfs.hpp b/sysfs.hpp
index b65deff..a809378 100644
--- a/sysfs.hpp
+++ b/sysfs.hpp
@@ -42,11 +42,11 @@
     virtual void setDelayOff(unsigned long ms);
 
   protected:
-    static constexpr char BRIGHTNESS[] = "brightness";
-    static constexpr char MAX_BRIGHTNESS[] = "max_brightness";
-    static constexpr char TRIGGER[] = "trigger";
-    static constexpr char DELAY_ON[] = "delay_on";
-    static constexpr char DELAY_OFF[] = "delay_off";
+    static constexpr const char* attrBrightness = "brightness";
+    static constexpr const char* attrMaxBrightness = "max_brightness";
+    static constexpr const char* attrTrigger = "trigger";
+    static constexpr const char* attrDelayOn = "delay_on";
+    static constexpr const char* attrDelayOff = "delay_off";
 
     std::filesystem::path root;
 };