diff --git a/include/sys/threads.h b/include/sys/threads.h
index 04d47197..3b0cfba7 100644
--- a/include/sys/threads.h
+++ b/include/sys/threads.h
@@ -83,7 +83,7 @@ static inline int beginthread(void (*start)(void *), unsigned int priority, void
 }
 
 
-extern int threadsinfo(int n, threadinfo_t *info);
+extern int threadsinfo(int *tid, unsigned int flags, int n, threadinfo_t *info);
 
 
 extern int priority(int priority);
diff --git a/include/time.h b/include/time.h
index ce30af5c..9bf91aeb 100644
--- a/include/time.h
+++ b/include/time.h
@@ -26,9 +26,10 @@
 #define CLOCKS_PER_SEC 1000000
 
 
-#define CLOCK_MONOTONIC     0
-#define CLOCK_MONOTONIC_RAW 1
-#define CLOCK_REALTIME      2
+#define CLOCK_MONOTONIC         (0U)
+#define CLOCK_MONOTONIC_RAW     (1U)
+#define CLOCK_REALTIME          (2U)
+#define CLOCK_THREAD_CPUTIME_ID (3U)
 
 
 #ifdef __cplusplus
diff --git a/time/time.c b/time/time.c
index a05178ad..bb4eadd3 100644
--- a/time/time.c
+++ b/time/time.c
@@ -14,6 +14,7 @@
  */
 
 #include <sys/time.h>
+#include <sys/threads.h>
 #include <time.h>
 #include <errno.h>
 #include <stdlib.h>
@@ -92,21 +93,29 @@ time_t time(time_t *tp)
 int clock_gettime(clockid_t clk_id, struct timespec *tp)
 {
 	time_t now, offs;
+	int tid;
+	threadinfo_t info;
 
 	if (tp == NULL) {
 		errno = EINVAL;
 		return -1;
 	}
 
-	if (clk_id != CLOCK_REALTIME && clk_id != CLOCK_MONOTONIC && clk_id != CLOCK_MONOTONIC_RAW) {
+	if (clk_id != CLOCK_REALTIME && clk_id != CLOCK_MONOTONIC && clk_id != CLOCK_MONOTONIC_RAW && clk_id != CLOCK_THREAD_CPUTIME_ID) {
 		errno = EINVAL;
 		return -1;
 	}
 
 	gettime(&now, &offs);
 
-	if (clk_id == CLOCK_REALTIME)
+	if (clk_id == CLOCK_REALTIME) {
 		now += offs;
+	}
+	else if (clk_id == CLOCK_THREAD_CPUTIME_ID) {
+		tid = gettid();
+		threadsinfo(&tid, PH_THREADINFO_CPUTIME, 1, &info);
+		now = info.cpuTime;
+	}
 
 	tp->tv_sec = now / (1000 * 1000);
 	now -= tp->tv_sec * 1000 * 1000;