diff --git a/headers/private/kernel/thread.h b/headers/private/kernel/thread.h
index de56a14275..5f46d09876 100755
--- a/headers/private/kernel/thread.h
+++ b/headers/private/kernel/thread.h
@@ -54,6 +54,7 @@ thread_id spawn_kernel_thread_etc(thread_func, const char *name, int32 priority,
 
 // used in syscalls.c
 status_t _user_set_thread_priority(thread_id thread, int32 newPriority);
+status_t _user_rename_thread(thread_id thread, const char *name);
 status_t _user_suspend_thread(thread_id thread);
 status_t _user_resume_thread(thread_id thread);
 thread_id _user_spawn_thread(thread_func func, const char *name, int32 priority, void *arg1, void *arg2);