diff --git a/lms-material/src/main/java/com/craigd/lmsmaterial/app/SettingsActivity.java b/lms-material/src/main/java/com/craigd/lmsmaterial/app/SettingsActivity.java
index 598ebca..448968a 100644
--- a/lms-material/src/main/java/com/craigd/lmsmaterial/app/SettingsActivity.java
+++ b/lms-material/src/main/java/com/craigd/lmsmaterial/app/SettingsActivity.java
@@ -390,7 +390,7 @@ public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
             }
 
             if (Utils.cutoutTopLeft(activity)) {
-                SwitchPreferenceCompat fullscreenPref = getPreferenceManager().findPreference("fullscreen");
+                SwitchPreferenceCompat fullscreenPref = getPreferenceManager().findPreference(FULLSCREEN_PREF_KEY);
                 if (null != fullscreenPref) {
                     fullscreenPref.setVisible(false);
                 }