diff -r -U3 xfce4-mount-plugin-0.6.7.orig/panel-plugin/mount-plugin.c xfce4-mount-plugin-0.6.7/panel-plugin/mount-plugin.c
--- xfce4-mount-plugin-0.6.7.orig/panel-plugin/mount-plugin.c	2015-03-19 14:17:51.261103122 +0100
+++ xfce4-mount-plugin-0.6.7/panel-plugin/mount-plugin.c	2015-03-20 11:28:20.709564879 +0100
@@ -1087,7 +1087,7 @@
     gtk_container_add (GTK_CONTAINER(plugin), mounter->button);
 
     xfce_panel_plugin_add_action_widget (plugin, mounter->button);
-
+    g_signal_emit_by_name(plugin, "size-changed");
 }
 
 XFCE_PANEL_PLUGIN_REGISTER (mount_construct);