diff --git a/matrix/services/room/src/main/kotlin/app/dapk/st/matrix/room/RoomService.kt b/matrix/services/room/src/main/kotlin/app/dapk/st/matrix/room/RoomService.kt
index 03a7dd9..41f36d1 100644
--- a/matrix/services/room/src/main/kotlin/app/dapk/st/matrix/room/RoomService.kt
+++ b/matrix/services/room/src/main/kotlin/app/dapk/st/matrix/room/RoomService.kt
@@ -30,7 +30,7 @@ interface RoomService : MatrixService {
 
     data class JoinedMember(
         val userId: UserId,
-        val displayName: String,
+        val displayName: String?,
         val avatarUrl: String?,
     )
 
diff --git a/matrix/services/room/src/main/kotlin/app/dapk/st/matrix/room/internal/DefaultRoomService.kt b/matrix/services/room/src/main/kotlin/app/dapk/st/matrix/room/internal/DefaultRoomService.kt
index 977a233..aa33c60 100644
--- a/matrix/services/room/src/main/kotlin/app/dapk/st/matrix/room/internal/DefaultRoomService.kt
+++ b/matrix/services/room/src/main/kotlin/app/dapk/st/matrix/room/internal/DefaultRoomService.kt
@@ -131,6 +131,6 @@ internal data class JoinedMembersResponse(
 
 @Serializable
 internal data class ApiJoinedMember(
-    @SerialName("display_name") val displayName: String,
+    @SerialName("display_name") val displayName: String? = null,
     @SerialName("avatar_url") val avatarUrl: String? = null,
 )
\ No newline at end of file