diff --git a/attic_util/time_benchmark.py b/attic_util/time_benchmark.py
index 8122bd8..4e8f74f 100644
--- a/attic_util/time_benchmark.py
+++ b/attic_util/time_benchmark.py
@@ -4,7 +4,7 @@
 class Benchmark():
     def __init__(self):
         self.time_wall_start = time.time()
-        self.time_cpu_start = time.clock()
+        self.time_cpu_start = time.process_time()
         self.logger = logbook.Logger(self.__class__.__name__)
 
     def diff_time_wall_secs(self):
@@ -14,5 +14,5 @@ def print_time(self, label=''):
         self.logger.info("%s wall=%.3fm cpu=%.3fm" % (
             label,
             self.diff_time_wall_secs() / 60.0,
-            (time.clock() - self.time_cpu_start) / 60.0,
+            (time.process_time() - self.time_cpu_start) / 60.0, 
         ))