diff --git a/app/src/main/java/eu/faircode/email/ApplicationEx.java b/app/src/main/java/eu/faircode/email/ApplicationEx.java
index 914efd457e..0ba0adfb45 100644
--- a/app/src/main/java/eu/faircode/email/ApplicationEx.java
+++ b/app/src/main/java/eu/faircode/email/ApplicationEx.java
@@ -209,6 +209,8 @@ public class ApplicationEx extends Application
 
         CoalMine.install(this);
 
+        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
+
         ProcessLifecycleOwner.get().getLifecycle().addObserver(new LifecycleObserver() {
             @OnLifecycleEvent(Lifecycle.Event.ON_START)
             public void onStart() {