diff --git a/tests/test-concurrency.py b/tests/test-concurrency.py
index f16f696b..3a0ce103 100755
--- a/tests/test-concurrency.py
+++ b/tests/test-concurrency.py
@@ -17,6 +17,7 @@
 # Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 # Boston, MA 02111-1307, USA.
 
+from __future__ import division
 from __future__ import print_function
 import os
 import sys
@@ -78,12 +79,12 @@ def run(n_committers, n_pruners):
     pruners = set()
 
     print('n_committers', n_committers, 'n_pruners', n_pruners, file=sys.stderr)
-    n_trees = n_committers / 2
+    n_trees = n_committers // 2
     for v in range(n_trees):
         mktree('tree{}'.format(v))
 
     for v in range(n_committers):
-        committers.add(commit(v / 2))
+        committers.add(commit(v // 2))
     for v in range(n_pruners):
         pruners.add(prune())
 
@@ -101,8 +102,8 @@ def run(n_committers, n_pruners):
         shutil.rmtree('tree{}'.format(v))
 
 # No concurrent pruning
-run(cpu_count()/2 + 2, 0)
+run(cpu_count() // 2 + 2, 0)
 print("ok no concurrent prunes")
 
-run(cpu_count()/2 + 4, 3)
+run(cpu_count() // 2 + 4, 3)
 print("ok concurrent prunes")