diff --git a/impression/impression_hp.py b/impression/impression_hp.py
index 5bd8e39f..e3336113 100644
--- a/impression/impression_hp.py
+++ b/impression/impression_hp.py
@@ -16,6 +16,7 @@ import logging
 import logging.handlers
 import BeautifulSoup
 import requests
+import math
 
 if '/usr/scripts' not in sys.path:
     sys.path.append('/usr/scripts')
@@ -417,8 +418,8 @@ class impression(object):
 
         c_agrafes = nb_agrafes * config_impression.c_agrafe
 
-        c_total = int(self._settings['copies'].value * ( c_impression +
-                      c_agrafes ) + 0.5) # arrondi et facture
+        c_total = math.floor(self._settings['copies'].value * ( c_impression +
+                      c_agrafes)) # arrondi et facture
 
         self._prix = float(c_total)/100
         return self._prix