diff --git a/features/announcement/api/src/main/kotlin/io/element/android/features/announcement/api/Announcement.kt b/features/announcement/api/src/main/kotlin/io/element/android/features/announcement/api/Announcement.kt
index a83d167ee2..1d6f357ca8 100644
--- a/features/announcement/api/src/main/kotlin/io/element/android/features/announcement/api/Announcement.kt
+++ b/features/announcement/api/src/main/kotlin/io/element/android/features/announcement/api/Announcement.kt
@@ -8,7 +8,11 @@
 
 package io.element.android.features.announcement.api
 
+import androidx.compose.runtime.Immutable
+
+@Immutable
 sealed interface Announcement {
+    @Immutable
     sealed interface Fullscreen : Announcement {
         data object Space : Fullscreen
     }
diff --git a/features/announcement/impl/src/main/kotlin/io/element/android/features/announcement/impl/AnnouncementState.kt b/features/announcement/impl/src/main/kotlin/io/element/android/features/announcement/impl/AnnouncementState.kt
index 3ef47d6ed0..fb0732450d 100644
--- a/features/announcement/impl/src/main/kotlin/io/element/android/features/announcement/impl/AnnouncementState.kt
+++ b/features/announcement/impl/src/main/kotlin/io/element/android/features/announcement/impl/AnnouncementState.kt
@@ -11,6 +11,6 @@ package io.element.android.features.announcement.impl
 import io.element.android.features.announcement.api.Announcement
 
 data class AnnouncementState(
-    val announcement: Announcement.Fullscreen? = null,
+    val announcement: Announcement.Fullscreen?,
     val eventSink: (AnnouncementEvent) -> Unit,
 )