diff --git a/dmp-frontend/src/app/ui/navbar/navbar.component.ts b/dmp-frontend/src/app/ui/navbar/navbar.component.ts
index 32b996f30..46269c046 100644
--- a/dmp-frontend/src/app/ui/navbar/navbar.component.ts
+++ b/dmp-frontend/src/app/ui/navbar/navbar.component.ts
@@ -348,12 +348,13 @@ export class NavbarComponent extends BaseComponent implements OnInit {
 				position: { top: '71px', right: '4.8em' },
 				width: "27.0rem"
 			});
-			this.inAppNotificationDialog.componentInstance.onReadAll.subscribe(() => {
+			const onReadAllSubscription = this.inAppNotificationDialog.componentInstance.onReadAll.subscribe(() => {
 				this.countUnreadInappNotifications();
 			});
 			this.inAppNotificationDialog.afterClosed().pipe(takeUntil(this._destroyed)).subscribe(result => {
 				this.countUnreadInappNotifications();
 				this.inAppNotificationDialog = null;
+				onReadAllSubscription.unsubscribe();
 			});
 		}
 	}