diff --git a/res/ui/preferences.ui b/res/ui/preferences.ui
index 2b4419b..7c7d80b 100644
--- a/res/ui/preferences.ui
+++ b/res/ui/preferences.ui
@@ -6,6 +6,8 @@
   <object class="HdyPreferencesWindow" id="window">
     <property name="can-focus">False</property>
     <property name="modal">True</property>
+    <property name="default-width">400</property>
+    <property name="default-height">400</property>
     <property name="type-hint">dialog</property>
     <child>
       <object class="HdyPreferencesPage">