diff --git a/src/include/lwip/pbuf.h b/src/include/lwip/pbuf.h
index cbc17c34..57a1e999 100644
--- a/src/include/lwip/pbuf.h
+++ b/src/include/lwip/pbuf.h
@@ -105,8 +105,8 @@ void pbuf_ref(struct pbuf *p);
 void pbuf_ref_chain(struct pbuf *p);
 u8_t pbuf_free(struct pbuf *p);
 u8_t pbuf_clen(struct pbuf *p);  
-void pbuf_cat(struct pbuf *h, struct pbuf *t);
-void pbuf_chain(struct pbuf *h, struct pbuf *t);
+void pbuf_cat(struct pbuf *head, struct pbuf *tail);
+void pbuf_chain(struct pbuf *head, struct pbuf *tail);
 struct pbuf *pbuf_dechain(struct pbuf *p);
 err_t pbuf_copy(struct pbuf *p_to, struct pbuf *p_from);
 u16_t pbuf_copy_partial(struct pbuf *p, void *dataptr, u16_t len, u16_t offset);