diff --git a/CHANGELOG b/CHANGELOG
index b6632ecb96..b3a193282c 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+* Change Uom.round into an instance method
 * Add Function fields on Product from Template
 
 Version 3.8.0 - 2015-11-02
diff --git a/tests/test_product.py b/tests/test_product.py
index ec5048ce2e..c0fa072d35 100644
--- a/tests/test_product.py
+++ b/tests/test_product.py
@@ -311,7 +311,7 @@ class ProductTestCase(ModuleTestCase):
             pool = Pool()
             Uom = pool.get('product.uom')
             for number, precision, result in tests:
-                self.assertEqual(Uom.round(number, precision), result)
+                self.assertEqual(Uom(rounding=precision).round(number), result)
 
 
 def suite():
diff --git a/uom.py b/uom.py
index 4b3945d57d..cdaa26cfd0 100644
--- a/uom.py
+++ b/uom.py
@@ -134,8 +134,8 @@ class Uom(ModelSQL, ModelView):
             ('symbol',) + tuple(clause[1:]),
             ]
 
-    @staticmethod
-    def round(number, precision=1.0):
+    def round(self, number):
+        precision = self.rounding
         i, d = divmod(precision, 1)
         base = round(number / precision)
         # Instead of multiply by the decimal part, we must divide by the
@@ -232,7 +232,7 @@ class Uom(ModelSQL, ModelView):
             amount = amount * to_uom.rate
 
         if round:
-            amount = cls.round(amount, to_uom.rounding)
+            amount = to_uom.round(amount)
 
         return amount