diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c
index 58bb09bd..4c9643a4 100644
--- a/src/core/tcp_out.c
+++ b/src/core/tcp_out.c
@@ -43,8 +43,6 @@
 #include "lwip/def.h"
 #include "lwip/opt.h"
 
-#include "arch/lib.h"
-
 #include "lwip/mem.h"
 #include "lwip/memp.h"
 #include "lwip/sys.h"