diff --git a/gui/qt/main_window.py b/gui/qt/main_window.py
index 153a08498..bd525c4ba 100644
--- a/gui/qt/main_window.py
+++ b/gui/qt/main_window.py
@@ -780,7 +780,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         addr = self.wallet.get_unused_address()
         if addr is None:
             from electrum.wallet import Imported_Wallet
-            if isinstance(self.wallet, Imported_Wallet):
+            if not self.wallet.is_deterministic():
                 self.show_message(_('No more addresses in your wallet.'))
                 return
             if not self.question(_("Warning: The next address will not be recovered automatically if you restore your wallet from seed; you may need to add it manually.\n\nThis occurs because you have too many unused addresses in your wallet. To avoid this situation, use the existing addresses first.\n\nCreate anyway?")):