diff --git a/lib/Crypto/Random/_UserFriendlyRNG.py b/lib/Crypto/Random/_UserFriendlyRNG.py
index 957e006..34e2a31 100644
--- a/lib/Crypto/Random/_UserFriendlyRNG.py
+++ b/lib/Crypto/Random/_UserFriendlyRNG.py
@@ -74,7 +74,7 @@ class _EntropyCollector(object):
         self._time_es.feed(struct.pack("@I", int(2**30 * (t - floor(t)))))
 
         # Add the fractional part of time.clock()
-        t = time.clock()
+        t = time.perf_counter()
         self._clock_es.feed(struct.pack("@I", int(2**30 * (t - floor(t)))))