diff --git a/app/src/main/java/eu/faircode/netguard/ActivitySettings.java b/app/src/main/java/eu/faircode/netguard/ActivitySettings.java
index 7ebe2363..46616a9a 100644
--- a/app/src/main/java/eu/faircode/netguard/ActivitySettings.java
+++ b/app/src/main/java/eu/faircode/netguard/ActivitySettings.java
@@ -174,12 +174,12 @@ public class ActivitySettings extends AppCompatActivity implements SharedPrefere
         updateTechnicalInfo();
 
         if (!Util.hasTelephony(this)) {
-            PreferenceCategory defaults = (PreferenceCategory)screen.findPreference("defaults");
+            PreferenceCategory defaults = (PreferenceCategory) screen.findPreference("category_defaults");
             defaults.removePreference(screen.findPreference("whitelist_other"));
             defaults.removePreference(screen.findPreference("screen_other"));
             defaults.removePreference(screen.findPreference("whitelist_roaming"));
 
-            PreferenceCategory options = (PreferenceCategory)screen.findPreference("options");
+            PreferenceCategory options = (PreferenceCategory) screen.findPreference("category_options");
             options.removePreference(screen.findPreference("use_metered"));
             options.removePreference(screen.findPreference("national_roaming"));
         }
diff --git a/app/src/main/res/xml/preferences.xml b/app/src/main/res/xml/preferences.xml
index b4be0c21..389f8522 100644
--- a/app/src/main/res/xml/preferences.xml
+++ b/app/src/main/res/xml/preferences.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
     <PreferenceCategory
-        android:key="defaults"
+        android:key="category_defaults"
         android:title="@string/setting_defaults">
         <SwitchPreference
             android:defaultValue="true"
@@ -25,7 +25,7 @@
             android:title="@string/setting_whitelist_roaming" />
     </PreferenceCategory>
     <PreferenceCategory
-        android:key="options"
+        android:key="category_options"
         android:title="@string/setting_options">
         <SwitchPreference
             android:defaultValue="false"
@@ -48,7 +48,7 @@
             android:title="@string/setting_national_roaming" />
     </PreferenceCategory>
     <PreferenceCategory
-        android:key="backup"
+        android:key="category_backup"
         android:title="@string/setting_backup">
         <Preference
             android:key="export"
@@ -58,7 +58,7 @@
             android:title="@string/setting_import" />
     </PreferenceCategory>
     <PreferenceCategory
-        android:key="technical"
+        android:key="category_technical"
         android:title="@string/setting_technical">
         <Preference android:key="technical" />
     </PreferenceCategory>