--- a/python/test/unit/common/test_timer.py
+++ b/python/test/unit/common/test_timer.py
@@ -21,6 +21,7 @@
 
 import gc
 import random
+import sys
 from time import sleep
 
 from dolfin import *
@@ -35,7 +36,7 @@
 
 def get_random_task_name():
     """Get pseudo-random string"""
-    return hex(random.randint(0, 1e32))
+    return hex(random.randint(0, sys.maxsize))
 
 
 def test_context_manager_named():