Index: uspace/app/tester/hw/serial/serial1.c
===================================================================
--- uspace/app/tester/hw/serial/serial1.c	(revision f9b2cb4cf365498e1fe141b1aa66950fbc3dcb17)
+++ uspace/app/tester/hw/serial/serial1.c	(revision 3345b8643e43d3ed4e6235473b2897c18e8a697c)
@@ -39,6 +39,8 @@
 #include <stdlib.h>
 #include <stdio.h>
+#include <stddef.h>
 #include <sys/types.h>
 #include <async.h>
+#include <thread.h>
 #include <ipc/services.h>
 #include <loc.h>
@@ -146,5 +148,5 @@
 		
 		if (read == 0)
-			usleep(DEFAULT_SLEEP);
+			thread_usleep(DEFAULT_SLEEP);
 		else {
 			buf[read] = 0;