diff --git a/src/thread/pthread_getcpuclockid.c b/src/thread/pthread_getcpuclockid.c
index cf3d2b84c83391e0efcebe13f5904eaaa344a97d..9df14fb68952463d5e4606ef19fa4f6ca043d2ec 100644
--- a/src/thread/pthread_getcpuclockid.c
+++ b/src/thread/pthread_getcpuclockid.c
@@ -2,5 +2,6 @@
 
 int pthread_getcpuclockid(pthread_t t, clockid_t *clockid)
 {
-	return ENOSYS;
+	*clockid = (-t->tid-1)*8U + 6;
+	return 0;
 }
diff --git a/src/time/clock_getcpuclockid.c b/src/time/clock_getcpuclockid.c
index 723840b00830c22517fd00224feb55544e50e916..8a0e2d4c3a622f9e8cf11c0cf7300eb1f59b9ea6 100644
--- a/src/time/clock_getcpuclockid.c
+++ b/src/time/clock_getcpuclockid.c
@@ -5,7 +5,10 @@
 
 int clock_getcpuclockid(pid_t pid, clockid_t *clk)
 {
-	if (pid && pid != getpid()) return EPERM;
-	*clk = CLOCK_PROCESS_CPUTIME_ID;
+	struct timespec ts;
+	clockid_t id = (-pid-1)*8U + 2;
+	int ret = __syscall(SYS_clock_getres, id, &ts);
+	if (ret) return -ret;
+	*clk = id;
 	return 0;
 }