diff --git a/include/nuttx/rptun/rptun.h b/include/nuttx/rptun/rptun.h
index 1cbe39894a..cfc8e0531f 100644
--- a/include/nuttx/rptun/rptun.h
+++ b/include/nuttx/rptun/rptun.h
@@ -351,7 +351,7 @@ begin_packed_struct struct rptun_cmd_s
 struct aligned_data(8) rptun_rsc_s
 {
   struct resource_table    rsc_tbl_hdr;
-  unsigned int             offset[2];
+  uint32_t                 offset[2];
   struct fw_rsc_trace      log_trace;
   struct fw_rsc_vdev       rpmsg_vdev;
   struct fw_rsc_vdev_vring rpmsg_vring0;