--- xfce4-mount-plugin-0.5.5/panel-plugin/devices.c~	2010-11-13 20:45:44.969354996 +0100
+++ xfce4-mount-plugin-0.5.5/panel-plugin/devices.c	2010-11-13 21:02:11.907383494 +0100
@@ -354,7 +354,7 @@
 
         if (show_message_dialog && !eject && val == TRUE && exit_status == 0)
             xfce_dialog_show_info (NULL, NULL, _("The device \"%s\" should be removable safely now."), pdisk->device);
-        if (show_message_dialog && disk_check_mounted(pdisk->device))
+        if (show_message_dialog && (disk_check_mounted(pdisk->device) || disk_check_mounted(pdisk->mount_point)))
             xfce_dialog_show_error (NULL, NULL, _("An error occurred. The device \"%s\" should not be removed!"), pdisk->device);
     }
 }