diff --git a/main/ui/src/main/java/org/cryptomator/ui/addvaultwizard/ChooseExistingVaultController.java b/main/ui/src/main/java/org/cryptomator/ui/addvaultwizard/ChooseExistingVaultController.java
index f2fac0c1f..99683d211 100644
--- a/main/ui/src/main/java/org/cryptomator/ui/addvaultwizard/ChooseExistingVaultController.java
+++ b/main/ui/src/main/java/org/cryptomator/ui/addvaultwizard/ChooseExistingVaultController.java
@@ -1,20 +1,19 @@
 package org.cryptomator.ui.addvaultwizard;
 
 import dagger.Lazy;
-import javafx.beans.property.BooleanProperty;
+import javafx.beans.binding.BooleanBinding;
 import javafx.beans.property.ObjectProperty;
-import javafx.beans.property.SimpleBooleanProperty;
 import javafx.collections.ObservableList;
 import javafx.fxml.FXML;
 import javafx.scene.Scene;
 import javafx.stage.FileChooser;
 import javafx.stage.Stage;
 import org.cryptomator.common.settings.VaultSettings;
+import org.cryptomator.common.vaults.Vault;
+import org.cryptomator.common.vaults.VaultFactory;
 import org.cryptomator.ui.common.FxController;
 import org.cryptomator.ui.common.FxmlFile;
 import org.cryptomator.ui.common.FxmlScene;
-import org.cryptomator.common.vaults.Vault;
-import org.cryptomator.common.vaults.VaultFactory;
 
 import javax.inject.Inject;
 import java.io.File;
@@ -28,7 +27,7 @@ public class ChooseExistingVaultController implements FxController {
 	private final Lazy<Scene> welcomeScene;
 	private final ObjectProperty<Path> vaultPath;
 	private final ObservableList<Vault> vaults;
-	private final BooleanProperty isVaultPathNull;
+	private final BooleanBinding vaultPathIsNull;
 	private final VaultFactory vaultFactory;
 	private final ResourceBundle resourceBundle;
 
@@ -40,8 +39,7 @@ public class ChooseExistingVaultController implements FxController {
 		this.vaults = vaults;
 		this.vaultFactory = vaultFactory;
 		this.resourceBundle = resourceBundle;
-		this.isVaultPathNull = new SimpleBooleanProperty();
-		isVaultPathNull.bind(vaultPath.isNull());
+		this.vaultPathIsNull = vaultPath.isNull();
 	}
 
 	@FXML
@@ -79,12 +77,12 @@ public class ChooseExistingVaultController implements FxController {
 		return vaultPath;
 	}
 
-	public boolean getIsVaultPathNull() {
-		return isVaultPathNull.get();
+	public boolean isVaultPathIsNull() {
+		return vaultPathIsNull.get();
 	}
 
-	public BooleanProperty isVaultPathNullProperty() {
-		return isVaultPathNull;
+	public BooleanBinding vaultPathIsNullProperty() {
+		return vaultPathIsNull;
 	}
 
 }
diff --git a/main/ui/src/main/resources/fxml/addvault_existing.fxml b/main/ui/src/main/resources/fxml/addvault_existing.fxml
index f69046c84..454cff7cd 100644
--- a/main/ui/src/main/resources/fxml/addvault_existing.fxml
+++ b/main/ui/src/main/resources/fxml/addvault_existing.fxml
@@ -28,7 +28,7 @@
 		<ButtonBar buttonMinWidth="120" buttonOrder="B+I">
 			<buttons>
 				<Button text="TODO Back" ButtonBar.buttonData="BACK_PREVIOUS" onAction="#back"/>
-				<Button text="TODO Open" ButtonBar.buttonData="FINISH" onAction="#finish" defaultButton="true" disable="${controller.isVaultPathNull}"/>
+				<Button text="TODO Open" ButtonBar.buttonData="FINISH" onAction="#finish" defaultButton="true" disable="${controller.vaultPathIsNull}"/>
 			</buttons>
 		</ButtonBar>
 	</children>