diff --git a/src/main/java/org/cryptomator/event/NotificationManager.java b/src/main/java/org/cryptomator/event/NotificationManager.java
index cdb9d99a8..7cd5ae1e1 100644
--- a/src/main/java/org/cryptomator/event/NotificationManager.java
+++ b/src/main/java/org/cryptomator/event/NotificationManager.java
@@ -73,7 +73,9 @@ public class NotificationManager {
 	 * @param target list where the filesystem events are copied to
 	 * @return {@code true}, if elements were copied
 	 */
-	public boolean addTo(List<VaultEvent> target) {
+	public boolean appendToAndClear(List<VaultEvent> target) {
+		//it is not clear, if addAll iterates thread-safe over the pendingEvents
+		//hence we synchronize moving (copy then clear) and adding-single-element operations
 		synchronized (this) {
 			var result = target.addAll(pendingEvents);
 			pendingEvents.clear();
diff --git a/src/main/java/org/cryptomator/ui/fxapp/FxNotificationManager.java b/src/main/java/org/cryptomator/ui/fxapp/FxNotificationManager.java
index 7be86fc50..c1100a2f4 100644
--- a/src/main/java/org/cryptomator/ui/fxapp/FxNotificationManager.java
+++ b/src/main/java/org/cryptomator/ui/fxapp/FxNotificationManager.java
@@ -43,7 +43,7 @@ public class FxNotificationManager {
 
 	private void checkForPendingNotifications() {
 		Platform.runLater(() -> {
-			if (notificationManager.addTo(eventsRequiringNotification)) {
+			if (notificationManager.appendToAndClear(eventsRequiringNotification)) {
 				applicationWindows.showNotification();
 			}
 		});