diff --git a/addons/point_of_sale/res_users.py b/addons/point_of_sale/res_users.py
index 8172d0052de..f1c613d5f06 100644
--- a/addons/point_of_sale/res_users.py
+++ b/addons/point_of_sale/res_users.py
@@ -1,38 +1,8 @@
 #!/usr/bin/env python
 from osv import osv, fields
 import math
+import openerp.addons.product.product
 
-def is_pair(x):
-    return not x%2
-# This code is a duplicate of product#check_ean function
-def check_ean(eancode):
-    if not eancode:
-        return True
-    if len(eancode) <> 13:
-        return False
-    try:
-        int(eancode)
-    except:
-        return False
-    oddsum=0
-    evensum=0
-    total=0
-    eanvalue=eancode
-    reversevalue = eanvalue[::-1]
-    finalean=reversevalue[1:]
-
-    for i in range(len(finalean)):
-        if is_pair(i):
-            oddsum += int(finalean[i])
-        else:
-            evensum += int(finalean[i])
-    total=(oddsum * 3) + evensum
-
-    check = int(10 - math.ceil(total % 10.0)) %10
-
-    if check != int(eancode[-1]):
-        return False
-    return True
 
 class res_users(osv.osv):
     _inherit = 'res.users'
@@ -43,7 +13,7 @@ class res_users(osv.osv):
 
     def _check_ean(self, cr, uid, ids, context=None):
         return all(
-            check_ean(user.ean13) == True
+            openerp.addons.product.product.check_ean(user.ean13) == True
             for user in self.browse(cr, uid, ids, context=context)
         )
 
diff --git a/addons/product/product.py b/addons/product/product.py
index 5a685711d4a..a3ca7793179 100644
--- a/addons/product/product.py
+++ b/addons/product/product.py
@@ -27,9 +27,6 @@ from _common import rounding
 import re
 from tools.translate import _
 
-def is_pair(x):
-    return not x%2
-
 def ean_checksum(eancode):
     """returns the checksum of an ean string of length 13, returns -1 if the string has the wrong length"""
     if len(eancode) <> 13:
@@ -42,7 +39,7 @@ def ean_checksum(eancode):
     finalean=reversevalue[1:]
 
     for i in range(len(finalean)):
-        if is_pair(i):
+        if i % 2 == 0:
             oddsum += int(finalean[i])
         else:
             evensum += int(finalean[i])