diff --git a/bus/driver.c b/bus/driver.c
index 5c4e9a2..21eb352 100644
--- a/bus/driver.c
+++ b/bus/driver.c
@@ -1535,6 +1535,7 @@ bus_driver_handle_get_connection_credentials (DBusConnection *connection,
   DBusMessageIter reply_iter;
   DBusMessageIter array_iter;
   unsigned long ulong_val;
+  char *windows_sid;
   const char *service;
 
   _DBUS_ASSERT_ERROR_IS_CLEAR (error);
@@ -1567,6 +1568,16 @@ bus_driver_handle_get_connection_credentials (DBusConnection *connection,
         goto oom;
     }
 
+  if (dbus_connection_get_windows_user (conn, &windows_sid))
+    {
+      if (!_dbus_asv_add_string (&array_iter, "WindowsSID", windows_sid))
+        {
+          dbus_free(windows_sid);
+          goto oom;
+        }
+        dbus_free(windows_sid);
+    }
+
   if (!_dbus_asv_close (&reply_iter, &array_iter))
     goto oom;