diff --git a/MVMCoreUI/Behaviors/ScreenBrightnessModifierBehavior.swift b/MVMCoreUI/Behaviors/ScreenBrightnessModifierBehavior.swift
index 422222b6..b6712354 100644
--- a/MVMCoreUI/Behaviors/ScreenBrightnessModifierBehavior.swift
+++ b/MVMCoreUI/Behaviors/ScreenBrightnessModifierBehavior.swift
@@ -54,7 +54,7 @@ class ScreenBrightnessModifierBehavior: PageVisibilityBehavior {
 
     //MARK:- Codable
     
-    enum CodingKeys: String, CodingKey {
+    private enum CodingKeys: String, CodingKey {
         case screenBrightness
     }