diff --git a/src/class/net/net_device.c b/src/class/net/net_device.c
index ad1d66fca..e3faa0187 100644
--- a/src/class/net/net_device.c
+++ b/src/class/net/net_device.c
@@ -89,7 +89,8 @@ static const struct ecm_notify_struct ecm_notify_csc =
   .uplink = 9728000,
 };
 
-CFG_TUSB_MEM_SECTION CFG_TUSB_MEM_ALIGN static union
+// TODO remove CFG_TUSB_MEM_SECTION, control internal buffer is already in this special section
+CFG_TUSB_MEM_SECTION TU_ATTR_ALIGNED(4) static union
 {
   uint8_t rndis_buf[120];
   struct ecm_notify_struct ecm_buf;
@@ -98,6 +99,7 @@ CFG_TUSB_MEM_SECTION CFG_TUSB_MEM_ALIGN static union
 //--------------------------------------------------------------------+
 // INTERNAL OBJECT & FUNCTION DECLARATION
 //--------------------------------------------------------------------+
+// TODO remove CFG_TUSB_MEM_SECTION
 CFG_TUSB_MEM_SECTION static netd_interface_t _netd_itf;
 
 static bool can_xmit;