diff --git a/midori/midori-app.c b/midori/midori-app.c
index 232bb567..b9e49716 100644
--- a/midori/midori-app.c
+++ b/midori/midori-app.c
@@ -661,7 +661,8 @@ midori_app_create_instance (MidoriApp*   app,
     display_name = g_strdup (gdk_display_get_name (display));
     n = strlen (display_name);
     for (i = 0; i < n; i++)
-        if (display_name[i] == ':' || display_name[i] == '.')
+        if (display_name[i] == ':' || display_name[i] == '.'
+         || display_name[i] == '\\')
             display_name[i] = '_';
     instance_name = g_strdup_printf ("de.twotoasts.%s_%s", name, display_name);