diff --git a/electrum/gui/qml/components/wizard/WCWalletName.qml b/electrum/gui/qml/components/wizard/WCWalletName.qml
index 07d12f8bb..3da936ee1 100644
--- a/electrum/gui/qml/components/wizard/WCWalletName.qml
+++ b/electrum/gui/qml/components/wizard/WCWalletName.qml
@@ -5,7 +5,7 @@ import QtQuick.Controls 2.1
 import org.electrum 1.0
 
 WizardComponent {
-    valid: wallet_name.text.length > 0
+    valid: wallet_name.text.length > 0 && !Daemon.availableWallets.wallet_name_exists(wallet_name.text)
 
     function apply() {
         wizard_data['wallet_name'] = wallet_name.text
diff --git a/electrum/gui/qml/qedaemon.py b/electrum/gui/qml/qedaemon.py
index cf6ba212b..6f4a50b5a 100644
--- a/electrum/gui/qml/qedaemon.py
+++ b/electrum/gui/qml/qedaemon.py
@@ -91,6 +91,7 @@ class QEWalletListModel(QAbstractListModel):
             self.wallets = wallets
             self.endRemoveRows()
 
+    @pyqtSlot(str, result=bool)
     def wallet_name_exists(self, name):
         for wallet_name, wallet_path in self.wallets:
             if name == wallet_name: