diff --git a/src/include/lwip/pbuf.h b/src/include/lwip/pbuf.h
index 5a4fc88b..3c79c4cc 100644
--- a/src/include/lwip/pbuf.h
+++ b/src/include/lwip/pbuf.h
@@ -222,6 +222,13 @@ struct pbuf {
 
   /** In case the user needs to store data custom data on a pbuf */
   LWIP_PBUF_CUSTOM_DATA
+#if LWIP_PTP
+  /**
+   * Timestamp that this packet was received.
+   */
+  s32_t time_sec;
+  s32_t time_nsec;
+#endif
 };