diff --git a/roulette.py b/roulette.py
index d8920a4..d3e1321 100644
--- a/roulette.py
+++ b/roulette.py
@@ -102,9 +102,9 @@ def init_db():
     cur_mysql.close()
 
 def duration_format(seconds):
-    hours = seconds / 3600
+    hours = seconds // 3600
     seconds -= 3600*hours
-    minutes = seconds / 60
+    minutes = seconds // 60
     seconds -= 60*minutes
     s_str = seconds <= 1 and 'seconde' or 'secondes'
     m_str = minutes <= 1 and 'minute' or 'minutes'