Index: kernel/generic/include/proc/thread.h
===================================================================
--- kernel/generic/include/proc/thread.h	(revision d52b82ad283f701c42ab1bc99c55e78550e313ca)
+++ kernel/generic/include/proc/thread.h	(revision cf240cbc0d420fb62b7b3b5c41946295fe7ff11a)
@@ -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