diff --git a/deluge/ui/gtkui/preferences.py b/deluge/ui/gtkui/preferences.py
index 02ec7d922..a76261aed 100644
--- a/deluge/ui/gtkui/preferences.py
+++ b/deluge/ui/gtkui/preferences.py
@@ -55,6 +55,7 @@ class Preferences(component.Component):
                     pkg_resources.resource_filename("deluge.ui.gtkui",
                                             "glade/preferences_dialog.glade"))
         self.pref_dialog = self.glade.get_widget("pref_dialog")
+        self.pref_dialog.set_transient_for(component.get("MainWindow").window)
         self.pref_dialog.set_icon(common.get_deluge_icon())
         self.treeview = self.glade.get_widget("treeview")
         self.notebook = self.glade.get_widget("notebook")