diff --git a/piwik/indico_piwik/queries/__init__.py b/piwik/indico_piwik/queries/__init__.py
index 69e1127..58b8484 100644
--- a/piwik/indico_piwik/queries/__init__.py
+++ b/piwik/indico_piwik/queries/__init__.py
@@ -39,21 +39,20 @@ class PiwikQueryReportEventBase(PiwikQueryReportBase):
 
     def call(self, segmentation_enabled=True, **query_params):
         if segmentation_enabled:
-            query_params['segmentation'] = self.get_segmentation()
+            query_params['segment'] = self.get_segmentation()
         return super(PiwikQueryReportEventBase, self).call(module='API', date=[self.start_date, self.end_date],
                                                            **query_params)
 
     def get_segmentation(self):
         segmentation = {'customVariablePageName1': ('==', 'Conference'),
                         'customVariablePageValue1': ('==', self.event_id)}
+
         if self.contrib_id:
             segmentation['customVariablePageName2'] = ('==', 'Contribution')
             segmentation['customVariablePageValue2'] = ('==', self.contrib_id)
 
         segments = set()
         for name, (equality, value) in segmentation.iteritems():
-            if isinstance(value, list):
-                value = ','.join(value)
             segment = '{}{}{}'.format(name, equality, value)
             segments.add(segment)
 
diff --git a/piwik/indico_piwik/queries/metrics.py b/piwik/indico_piwik/queries/metrics.py
index 62a2719..fc589e3 100644
--- a/piwik/indico_piwik/queries/metrics.py
+++ b/piwik/indico_piwik/queries/metrics.py
@@ -20,20 +20,20 @@ class PiwikQueryReportEventMetricBase(PiwikQueryReportEventBase):
 
 class PiwikQueryReportEventMetricVisitsBase(PiwikQueryReportEventMetricBase):
     def get_result(self, reduced=True):
-        query_params = {} if reduced else {'segmentation_enabled': False}
-        result = get_json_from_remote_server(self.call, **query_params)
+        result = get_json_from_remote_server(self.call)
         if reduced:
             return int(reduce_json(result)) if result else 0
         return result if result else {}
 
 
 class PiwikQueryReportEventMetricDownloads(PiwikQueryReportEventMetricBase):
-    def call(self, download_url):
+    def call(self, download_url, **query_params):
         return super(PiwikQueryReportEventMetricDownloads, self).call(method='Actions.getDownload',
-                                                                      downloadUrl=quote(download_url))
+                                                                      downloadUrl=quote(download_url),
+                                                                      **query_params)
 
     def get_result(self, download_url):
-        result = get_json_from_remote_server(self.call, download_url=download_url)
+        result = get_json_from_remote_server(self.call, download_url=download_url, segmentation_enabled=False)
         return {'cumulative': self._get_cumulative_results(result),
                 'individual': self._get_per_day_results(result)}