diff --git a/ceilometerclient/tests/v2/test_statistics.py b/ceilometerclient/tests/v2/test_statistics.py
index 68a26726..dde4dd60 100644
--- a/ceilometerclient/tests/v2/test_statistics.py
+++ b/ceilometerclient/tests/v2/test_statistics.py
@@ -181,13 +181,13 @@ class StatisticsManagerTest(utils.BaseTestCase):
 
     def test_list_by_meter_name_with_aggregates(self):
         aggregates = [
+            {
+                'func': 'count',
+            },
             {
                 'func': 'cardinality',
                 'param': 'resource_id',
             },
-            {
-                'func': 'count',
-            }
         ]
         stats = list(self.mgr.list(meter_name='instance',
                                    aggregates=aggregates))
diff --git a/ceilometerclient/v2/statistics.py b/ceilometerclient/v2/statistics.py
index 689992c6..d0b56c9f 100644
--- a/ceilometerclient/v2/statistics.py
+++ b/ceilometerclient/v2/statistics.py
@@ -26,13 +26,19 @@ class StatisticsManager(base.Manager):
     def _build_aggregates(self, aggregates):
         url_aggregates = []
         for aggregate in aggregates:
-            url_aggregates.append(
-                "aggregate.func=%(func)s" % aggregate
-            )
             if 'param' in aggregate:
-                url_aggregates.append(
+                url_aggregates.insert(
+                    0,
                     "aggregate.param=%(param)s" % aggregate
                 )
+                url_aggregates.insert(
+                    0,
+                    "aggregate.func=%(func)s" % aggregate
+                )
+            else:
+                url_aggregates.append(
+                    "aggregate.func=%(func)s" % aggregate
+                )
         return url_aggregates
 
     def list(self, meter_name, q=None, period=None, groupby=[], aggregates=[]):