diff --git a/tools/testing/selftests/intel_pstate/aperf.c b/tools/testing/selftests/intel_pstate/aperf.c
index f6cd03a87493..7e35e7872f16 100644
--- a/tools/testing/selftests/intel_pstate/aperf.c
+++ b/tools/testing/selftests/intel_pstate/aperf.c
@@ -6,7 +6,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
-#include <sys/timeb.h>
+#include <time.h>
 #include <sched.h>
 #include <errno.h>
 #include <string.h>
@@ -22,10 +22,12 @@ int main(int argc, char **argv) {
 	long long tsc, old_tsc, new_tsc;
 	long long aperf, old_aperf, new_aperf;
 	long long mperf, old_mperf, new_mperf;
-	struct timeb before, after;
+	struct timespec before, after;
+        clockid_t clkid;
 	long long int start, finish, total;
 	cpu_set_t cpuset;
 
+
 	if (argc != 2) {
 		usage(argv[0]);
 		return 1;
@@ -41,6 +43,10 @@ int main(int argc, char **argv) {
 
 	sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
 	fd = open(msr_file_name, O_RDONLY);
+        #define CLOCKFD 3
+        #define FD_TO_CLOCKID(fd)   ((~(clockid_t) (fd) << 3) | CLOCKFD)
+        clkid = FD_TO_CLOCKID(fd);
+
 
 	if (fd == -1) {
 		printf("/dev/cpu/%d/msr: %s\n", cpu, strerror(errno));
@@ -55,7 +61,7 @@ int main(int argc, char **argv) {
 		return 1;
 	}
 
-	ftime(&before);
+	clock_gettime(clkid,&before);
 	pread(fd, &old_tsc,  sizeof(old_tsc), 0x10);
 	pread(fd, &old_aperf,  sizeof(old_mperf), 0xe7);
 	pread(fd, &old_mperf,  sizeof(old_aperf), 0xe8);
@@ -64,7 +70,7 @@ int main(int argc, char **argv) {
 		sqrt(i);
 	}
 
-	ftime(&after);
+	clock_gettime(clkid,&after);
 	pread(fd, &new_tsc,  sizeof(new_tsc), 0x10);
 	pread(fd, &new_aperf,  sizeof(new_mperf), 0xe7);
 	pread(fd, &new_mperf,  sizeof(new_aperf), 0xe8);
@@ -73,11 +79,10 @@ int main(int argc, char **argv) {
 	aperf = new_aperf-old_aperf;
 	mperf = new_mperf-old_mperf;
 
-	start = before.time*1000 + before.millitm;
-	finish = after.time*1000 + after.millitm;
-	total = finish - start;
-
-	printf("runTime: %4.2f\n", 1.0*total/1000);
-	printf("freq: %7.0f\n", tsc / (1.0*aperf / (1.0 * mperf)) / total);
+	start = before.tv_sec*1000000 + before.tv_nsec;
+	finish = after.tv_sec*1000000 + after.tv_nsec;
+	total = finish - start; 
+	printf("runTime: %4.2f\n", 1.0*total/1000000); 
+	printf("freq: %7.0f\n", tsc / (1.0 * aperf /1.0 * (mperf)) / total);
 	return 0;
 }