diff --git a/libc/include/sys/linux-unistd.h b/libc/include/sys/linux-unistd.h
index d945d87..8422d7e 100644
--- a/libc/include/sys/linux-unistd.h
+++ b/libc/include/sys/linux-unistd.h
@@ -142,7 +142,7 @@
 int              clock_gettime (clockid_t clk_id, struct timespec *tp);
 int              clock_settime (clockid_t clk_id, const struct timespec *tp);
 int              clock_getres (clockid_t clk_id, struct timespec *res);
-int              clock_nanosleep (const struct timespec *req, struct timespec *rem);
+int              clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req, struct timespec *rem);
 int              getitimer (int, const struct itimerval *);
 int              setitimer (int, const struct itimerval *, struct itimerval *);
 int              __timer_create (clockid_t clockid, struct sigevent *evp, timer_t *timerid);