diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c
index 57b451ab..da5e7e4a 100644
--- a/src/core/tcp_out.c
+++ b/src/core/tcp_out.c
@@ -1356,12 +1356,12 @@ tcp_rexmit_rto(struct tcp_pcb *pcb)
   for (seg = pcb->unacked; seg->next != NULL; seg = seg->next);
   /* concatenate unsent queue after unacked queue */
   seg->next = pcb->unsent;
-#if TCP_OVERSIZE && TCP_OVERSIZE_DBGCHECK
+#if TCP_OVERSIZE_DBGCHECK
   /* if last unsent changed, we need to update unsent_oversize */
   if (pcb->unsent == NULL) {
     pcb->unsent_oversize = seg->oversize_left;
   }
-#endif /* TCP_OVERSIZE && TCP_OVERSIZE_DBGCHECK*/
+#endif /* TCP_OVERSIZE_DBGCHECK */
   /* unsent queue is the concatenated queue (of unacked, unsent) */
   pcb->unsent = pcb->unacked;
   /* unacked queue is now empty */