diff --git a/src/core/tcp_in.c b/src/core/tcp_in.c
index 0a0d91a0..446380f2 100644
--- a/src/core/tcp_in.c
+++ b/src/core/tcp_in.c
@@ -349,6 +349,7 @@ tcp_input(struct pbuf *p, struct netif *inp)
           if (pcb->flags & TF_RXCLOSED) {
             /* received data although already closed -> abort (send RST) to
                notify the remote host that not all data has been processed */
+            pbuf_free(recv_data);
             tcp_abort(pcb);
             goto aborted;
           }