diff --git a/data/ui/source-dialog.ui b/data/ui/source-dialog.ui
index 0f79c9d9..709708f3 100644
--- a/data/ui/source-dialog.ui
+++ b/data/ui/source-dialog.ui
@@ -7,6 +7,7 @@
     <property name="type_hint">dialog</property>
     <property name="use_header_bar">1</property>
     <property name="border_width">0</property>
+    <property name="width_request">450</property>
     <property name="default_width">550</property>
     <property name="default_height">500</property>
     <child internal-child="vbox">