diff --git a/src/include/lwip/tcp.h b/src/include/lwip/tcp.h
index cbc0e75b..d200e7c3 100644
--- a/src/include/lwip/tcp.h
+++ b/src/include/lwip/tcp.h
@@ -40,8 +40,6 @@
 #include "lwip/ip.h"
 #include "lwip/icmp.h"
 
-#include "lwip/sys.h"
-
 #include "lwip/err.h"
 
 struct tcp_pcb;