diff --git a/dachlatten-android/src/main/kotlin/de/sipgate/dachlatten/android/lifecycle/AbstractActivityLifecycleCallbacks.kt b/dachlatten-android/src/main/kotlin/de/sipgate/dachlatten/android/lifecycle/AbstractActivityLifecycleCallbacks.kt
index e612da2..b589fe3 100644
--- a/dachlatten-android/src/main/kotlin/de/sipgate/dachlatten/android/lifecycle/AbstractActivityLifecycleCallbacks.kt
+++ b/dachlatten-android/src/main/kotlin/de/sipgate/dachlatten/android/lifecycle/AbstractActivityLifecycleCallbacks.kt
@@ -4,7 +4,7 @@ import android.app.Activity
 import android.app.Application
 import android.os.Bundle
 
-class AbstractActivityLifecycleCallbacks: Application.ActivityLifecycleCallbacks {
+abstract class AbstractActivityLifecycleCallbacks: Application.ActivityLifecycleCallbacks {
     override fun onActivityCreated(
         activity: Activity,
         savedInstanceState: Bundle?