diff --git a/tools/nxstyle.c b/tools/nxstyle.c
index d7ee750cfbcc6..36c0834bcc4f8 100644
--- a/tools/nxstyle.c
+++ b/tools/nxstyle.c
@@ -250,6 +250,13 @@ static const char *g_white_prefix[] =
   "UInt64",
   "Float32",
   "Float64",
+
+  /* Ref:  apps/system/microros/transport
+   * Micro XRCE-DDS Client custom transport struct exposed in the
+   * callback prototypes registered via rmw_uros_set_custom_transport().
+   */
+
+  "uxrCustom",           /* uxrCustomTransport */
   NULL
 };