diff --git a/libc/include/time.h b/libc/include/time.h
index e34eb34..1b0f6a1 100644
--- a/libc/include/time.h
+++ b/libc/include/time.h
@@ -85,6 +85,8 @@
 
 extern clock_t clock(void) __LIBC_ABI_PUBLIC__;
 
+extern int clock_getcpuclockid(pid_t, clockid_t*) __LIBC_ABI_PUBLIC__;
+
 extern int clock_getres(clockid_t, struct timespec*) __LIBC_ABI_PUBLIC__;
 extern int clock_gettime(clockid_t, struct timespec*) __LIBC_ABI_PUBLIC__;
 extern int clock_nanosleep(clockid_t, int, const struct timespec*, struct timespec*) __LIBC_ABI_PUBLIC__;