diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 98d9d21bfd2..5c587e3cc67 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -529,7 +529,11 @@ void BitcoinGUI::createActions()
         connect(m_mask_values_action, &QAction::toggled, this, &BitcoinGUI::setPrivacy);
         connect(m_mask_values_action, &QAction::toggled, this, &BitcoinGUI::enableHistoryAction);
         GUIUtil::ExceptionSafeConnect(m_export_watchonly_action, &QAction::triggered, [this](bool) {
-            QString destination = GUIUtil::getSaveFileName(this, tr("Save Watch-only Wallet Export"), QString(), QString(), nullptr);
+            QString destination = GUIUtil::getSaveFileName(this,
+                tr("Save Watch-only Wallet Export"), QString(),
+                //: Name of the wallet data file format.
+                tr("Wallet Data") + QLatin1String(" (*.dat)"), nullptr);
+
             if (destination.isEmpty()) return;
             WalletModel* model = walletFrame->currentWalletModel();
             if (!Assume(model)) return;