Index: plugins/thunar-wallpaper/twp-provider.c
===================================================================
--- plugins/thunar-wallpaper/twp-provider.c	(revision 29701)
+++ plugins/thunar-wallpaper/twp-provider.c	(working copy)
@@ -204,6 +204,7 @@
     gchar *image_style_prop;
     gchar *file_uri;
     gchar *file_name = NULL;
+    gchar *quoted_file_name = NULL;
     gchar *hostname = NULL;
     gchar *command;
 
@@ -211,6 +212,7 @@
     {
         file_uri = thunarx_file_info_get_uri (file_info);
         file_name = g_filename_from_uri (file_uri, &hostname, NULL);
+        quoted_file_name = g_shell_quote (file_name);
         if (hostname != NULL)
         {
             g_free (hostname);
@@ -243,7 +245,7 @@
             image_show_prop = g_strdup_printf("/backdrop/screen%d/monitor%d/image-show", screen_nr, monitor_nr);
             image_style_prop = g_strdup_printf("/backdrop/screen%d/monitor%d/image-style", screen_nr, monitor_nr);
 
-            command = g_strdup_printf ("xfconf-query -c xfce4-desktop -p %s --create -t string -s %s", image_path_prop, file_name);
+            command = g_strdup_printf ("xfconf-query -c xfce4-desktop -p %s --create -t string -s %s", image_path_prop, quoted_file_name);
             g_spawn_command_line_async (command, NULL);
             g_free (command);
 
@@ -282,6 +284,7 @@
             break;
     }
 
+    g_free(quoted_file_name);
     g_free(file_name);
 }