Index: kernel/generic/include/proc/thread.h
===================================================================
--- kernel/generic/include/proc/thread.h	(revision d52b82ad283f701c42ab1bc99c55e78550e313ca)
+++ kernel/generic/include/proc/thread.h	(revision 7f5e0700a17e22719744070bb5e06a9f2ff5a05b)
@@ -263,4 +263,5 @@
 extern unative_t sys_thread_exit(int);
 extern unative_t sys_thread_get_id(thread_id_t *);
+extern unative_t sys_thread_usleep(uint32_t);
 
 #endif