diff --git a/app/src/main/java/info/nightscout/androidaps/activities/PreferencesActivity.kt b/app/src/main/java/info/nightscout/androidaps/activities/PreferencesActivity.kt
index edff599122..0b87fb461e 100644
--- a/app/src/main/java/info/nightscout/androidaps/activities/PreferencesActivity.kt
+++ b/app/src/main/java/info/nightscout/androidaps/activities/PreferencesActivity.kt
@@ -19,6 +19,7 @@ class PreferencesActivity : NoSplashAppCompatActivity(), PreferenceFragmentCompa
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        setTheme(R.style.AppTheme)
         binding = ActivityPreferencesBinding.inflate(layoutInflater)
         setContentView(binding.root)
 
diff --git a/core/src/main/res/values/styles.xml b/core/src/main/res/values/styles.xml
index f30960563c..0fb8505200 100644
--- a/core/src/main/res/values/styles.xml
+++ b/core/src/main/res/values/styles.xml
@@ -30,6 +30,7 @@
         <item name="notificationAnnouncement">@color/notificationAnnouncement</item>
 
         <item name="actionModeCloseDrawable">@drawable/ic_close</item>
+        <item name="alertDialogTheme">@style/DialogTheme</item>
     </style>
 
     <style name="AppTheme.NoActionBar" parent="Theme.MaterialComponents.NoActionBar">