diff --git a/prefs.js b/prefs.js
index 2021052..40f889a 100644
--- a/prefs.js
+++ b/prefs.js
@@ -805,6 +805,7 @@ function buildPrefsWidget() {
 }
 
 function fillPreferencesWindow(window) {
+  window.set_default_size(700, 700);
   var dialog = new PreferencesDialog();
   window.add(dialog.getWidget());
 }
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