diff --git a/src/domain/session/toast/BaseToastNotificationViewModel.ts b/src/domain/session/toast/BaseToastNotificationViewModel.ts
index 0ace7fdf..01ec688b 100644
--- a/src/domain/session/toast/BaseToastNotificationViewModel.ts
+++ b/src/domain/session/toast/BaseToastNotificationViewModel.ts
@@ -28,7 +28,7 @@ export abstract class BaseToastNotificationViewModel<T extends BaseClassOptions
         super(options);
     }
 
-    dismiss() {
+    dismiss(): void {
         this.getOption("dismiss")();
     }
 }
diff --git a/src/domain/session/toast/CallToastNotificationViewModel.ts b/src/domain/session/toast/CallToastNotificationViewModel.ts
index ebc66167..4c005cc5 100644
--- a/src/domain/session/toast/CallToastNotificationViewModel.ts
+++ b/src/domain/session/toast/CallToastNotificationViewModel.ts
@@ -53,7 +53,7 @@ export class CallToastNotificationViewModel extends BaseToastNotificationViewMod
         }));
     }
 
-    async join() {
+    async join(): Promise<void> {
         await this.logAndCatch("CallToastNotificationViewModel.join", async (log) => {
             const stream = await this.platform.mediaDevices.getMediaTracks(false, true);
             const localMedia = new LocalMedia().withUserMedia(stream);
@@ -79,19 +79,19 @@ export class CallToastNotificationViewModel extends BaseToastNotificationViewMod
         return this.call.members.size;
     }
 
-    get avatarLetter() {
+    get avatarLetter(): string {
         return avatarInitials(this.roomName);
     }
 
-    get avatarColorNumber() {
+    get avatarColorNumber(): number {
         return getIdentifierColorNumber(this.room.avatarColorId);
     }
 
-    avatarUrl(size: number) {
+    avatarUrl(size: number): string | undefined {
         return getAvatarHttpUrl(this.room.avatarUrl, size, this.platform, this.room.mediaRepository);
     }
 
-    get avatarTitle() {
+    get avatarTitle(): string {
         return this.roomName;
     }
 }