diff --git a/main/commons/src/main/java/org/cryptomator/common/LazyInitializer.java b/main/commons/src/main/java/org/cryptomator/common/LazyInitializer.java
index eb7a9400f..1316c50d1 100644
--- a/main/commons/src/main/java/org/cryptomator/common/LazyInitializer.java
+++ b/main/commons/src/main/java/org/cryptomator/common/LazyInitializer.java
@@ -17,16 +17,17 @@ public final class LazyInitializer {
 	 * @return The initialized value
 	 */
 	public static <T> T initializeLazily(AtomicReference<T> reference, Supplier<T> factory) {
-		final T existingInstance = reference.get();
-		if (existingInstance != null) {
-			return existingInstance;
+		final T existing = reference.get();
+		if (existing != null) {
+			return existing;
 		} else {
-			final T newInstance = factory.get();
-			if (reference.compareAndSet(null, newInstance)) {
-				return newInstance;
-			} else {
-				return reference.get();
-			}
+			return reference.updateAndGet(currentValue -> {
+				if (currentValue == null) {
+					return factory.get();
+				} else {
+					return currentValue;
+				}
+			});
 		}
 	}
 
diff --git a/main/ui/pom.xml b/main/ui/pom.xml
index 2c261d3ad..6ceb70390 100644
--- a/main/ui/pom.xml
+++ b/main/ui/pom.xml
@@ -54,6 +54,11 @@
 			<groupId>org.cryptomator</groupId>
 			<artifactId>frontend-webdav</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.cryptomator</groupId>
+			<artifactId>jni</artifactId>
+			<version>1.0.0-SNAPSHOT</version>
+		</dependency>
 		
 		<!-- EasyBind -->
 		<dependency>
diff --git a/main/ui/src/main/java/org/cryptomator/ui/CryptomatorComponent.java b/main/ui/src/main/java/org/cryptomator/ui/CryptomatorComponent.java
index 095caeb89..e82e006e9 100644
--- a/main/ui/src/main/java/org/cryptomator/ui/CryptomatorComponent.java
+++ b/main/ui/src/main/java/org/cryptomator/ui/CryptomatorComponent.java
@@ -8,10 +8,12 @@
  *******************************************************************************/
 package org.cryptomator.ui;
 
+import java.util.Optional;
 import java.util.concurrent.ExecutorService;
 
 import javax.inject.Singleton;
 
+import org.cryptomator.jni.MacFunctions;
 import org.cryptomator.ui.controllers.MainController;
 import org.cryptomator.ui.settings.Localization;
 import org.cryptomator.ui.util.AsyncTaskService;
@@ -34,4 +36,7 @@ interface CryptomatorComponent {
 	Localization localization();
 
 	ExitUtil exitUtil();
-}
\ No newline at end of file
+
+	Optional<MacFunctions> nativeMacFunctions();
+
+}
diff --git a/main/ui/src/main/java/org/cryptomator/ui/CryptomatorModule.java b/main/ui/src/main/java/org/cryptomator/ui/CryptomatorModule.java
index b62f631c4..f4cc072ae 100644
--- a/main/ui/src/main/java/org/cryptomator/ui/CryptomatorModule.java
+++ b/main/ui/src/main/java/org/cryptomator/ui/CryptomatorModule.java
@@ -8,6 +8,7 @@
  *******************************************************************************/
 package org.cryptomator.ui;
 
+import java.util.Optional;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
@@ -19,6 +20,8 @@ import org.cryptomator.crypto.engine.impl.CryptoEngineModule;
 import org.cryptomator.frontend.FrontendFactory;
 import org.cryptomator.frontend.webdav.WebDavModule;
 import org.cryptomator.frontend.webdav.WebDavServer;
+import org.cryptomator.jni.JniModule;
+import org.cryptomator.jni.MacFunctions;
 import org.cryptomator.ui.model.VaultObjectMapperProvider;
 import org.cryptomator.ui.settings.Settings;
 import org.cryptomator.ui.settings.SettingsProvider;
@@ -99,4 +102,10 @@ class CryptomatorModule {
 		return closer.closeLater(webDavServer, WebDavServer::stop).get().orElseThrow(IllegalStateException::new);
 	}
 
+	@Provides
+	@Singleton
+	Optional<MacFunctions> provideMacFunctions() {
+		return JniModule.macFunctions();
+	}
+
 }
diff --git a/main/ui/src/main/java/org/cryptomator/ui/ExitUtil.java b/main/ui/src/main/java/org/cryptomator/ui/ExitUtil.java
index ff0cbe0dd..7352d149c 100644
--- a/main/ui/src/main/java/org/cryptomator/ui/ExitUtil.java
+++ b/main/ui/src/main/java/org/cryptomator/ui/ExitUtil.java
@@ -21,6 +21,7 @@ import java.awt.event.ActionEvent;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.io.IOException;
+import java.util.Optional;
 import java.util.concurrent.TimeUnit;
 
 import javax.inject.Inject;
@@ -32,6 +33,9 @@ import javax.script.ScriptException;
 import javax.swing.SwingUtilities;
 
 import org.apache.commons.lang3.SystemUtils;
+import org.cryptomator.jni.JniException;
+import org.cryptomator.jni.MacApplicationUiState;
+import org.cryptomator.jni.MacFunctions;
 import org.cryptomator.ui.settings.Localization;
 import org.cryptomator.ui.settings.Settings;
 import org.slf4j.Logger;
@@ -48,12 +52,14 @@ class ExitUtil {
 	private final Stage mainWindow;
 	private final Localization localization;
 	private final Settings settings;
+	private final Optional<MacFunctions> macFunctions;
 
 	@Inject
-	public ExitUtil(@Named("mainWindow") Stage mainWindow, Localization localization, Settings settings) {
+	public ExitUtil(@Named("mainWindow") Stage mainWindow, Localization localization, Settings settings, Optional<MacFunctions> macFunctions) {
 		this.mainWindow = mainWindow;
 		this.localization = localization;
 		this.settings = settings;
+		this.macFunctions = macFunctions;
 	}
 
 	public void initExitHandler(Runnable exitCommand) {
@@ -88,6 +94,7 @@ class ExitUtil {
 				if (Platform.isImplicitExit()) {
 					exitCommand.run();
 				} else {
+					macFunctions.map(MacFunctions::uiState).ifPresent(JniException.ignore(MacApplicationUiState::transformToAgentApplication));
 					mainWindow.close();
 					this.showTrayNotification(trayIcon);
 				}
@@ -189,6 +196,7 @@ class ExitUtil {
 
 	private void restoreFromTray(ActionEvent event) {
 		Platform.runLater(() -> {
+			macFunctions.map(MacFunctions::uiState).ifPresent(JniException.ignore(MacApplicationUiState::transformToForegroundApplication));
 			mainWindow.show();
 			mainWindow.requestFocus();
 		});
diff --git a/main/ui/src/main/java/org/cryptomator/ui/MainApplication.java b/main/ui/src/main/java/org/cryptomator/ui/MainApplication.java
index d28721ffa..8e5f60b06 100644
--- a/main/ui/src/main/java/org/cryptomator/ui/MainApplication.java
+++ b/main/ui/src/main/java/org/cryptomator/ui/MainApplication.java
@@ -15,6 +15,9 @@ import java.nio.file.Path;
 import java.util.concurrent.ExecutionException;
 
 import org.apache.commons.lang3.SystemUtils;
+import org.cryptomator.jni.JniException;
+import org.cryptomator.jni.MacApplicationUiState;
+import org.cryptomator.jni.MacFunctions;
 import org.cryptomator.ui.controllers.MainController;
 import org.cryptomator.ui.util.ActiveWindowStyleSupport;
 import org.cryptomator.ui.util.DeferredCloser;
@@ -67,6 +70,7 @@ public class MainApplication extends Application {
 		}
 
 		// show window and start observing its focus:
+		comp.nativeMacFunctions().map(MacFunctions::uiState).ifPresent(JniException.ignore(MacApplicationUiState::transformToForegroundApplication));
 		primaryStage.show();
 		ActiveWindowStyleSupport.startObservingFocus(primaryStage);
 		comp.exitUtil().initExitHandler(this::quit);