diff --git a/lwip/src/arch/sys_arch.c b/lwip/src/arch/sys_arch.c
index 9eb19c7b..486d2faa 100644
--- a/lwip/src/arch/sys_arch.c
+++ b/lwip/src/arch/sys_arch.c
@@ -19,9 +19,9 @@
 #include <metalsvm/stddef.h>
 #include <metalsvm/time.h>
 
+#include "lwip/opt.h"
 #include "lwip/debug.h"
 #include "lwip/sys.h"
-#include "lwip/opt.h"
 #include "lwip/stats.h"
 
 #ifndef TRUE
@@ -87,7 +87,7 @@ sys_thread_t sys_thread_new(const char *name, lwip_thread_fn thread, void *arg,
 	sys_thread_t tmp;
 
 	err = create_kernel_task(&tmp, thread, arg, prio);
-	LWIP_DEBUGF(SYS_DEBUG, ("sys_thread_new: create_kernel_task %d, id = %u", err, tmp));
+	LWIP_DEBUGF(SYS_DEBUG, ("sys_thread_new: create_kernel_task %d, id = %u\n", err, tmp));
 
 	return tmp;
 }
@@ -196,6 +196,8 @@ u32_t sys_arch_mbox_tryfetch(sys_mbox_t* mbox, void** msg)
  */
 err_t sys_mbox_new(sys_mbox_t* mbox, int size)
 {
+	LWIP_DEBUGF(SYS_DEBUG, ("sys_mbox_new: create mailbox with the minimum size: %d\n", size));
+
 	mbox->valid = TRUE;
 	return mailbox_ptr_init(&mbox->mailbox);
 }
@@ -217,7 +219,7 @@ err_t sys_mbox_trypost(sys_mbox_t *mbox, void *msg)
 
 	err = mailbox_ptr_trypost(&mbox->mailbox, msg);
 	if (err != 0) {
-		LWIP_DEBUGF(SYS_DEBUG, ("sys_mbox_trypost: %d"\n, err));
+		LWIP_DEBUGF(SYS_DEBUG, ("sys_mbox_trypost: %d\n", err));
 	}
 
 	return err;