diff --git a/src/calibre/gui2/store/stores/publio_plugin.py b/src/calibre/gui2/store/stores/publio_plugin.py
index be714300a9..6854d4e5e7 100644
--- a/src/calibre/gui2/store/stores/publio_plugin.py
+++ b/src/calibre/gui2/store/stores/publio_plugin.py
@@ -24,7 +24,7 @@ from calibre.gui2.store.web_store_dialog import WebStoreDialog
 class PublioStore(BasicStoreConfig, StorePlugin):
 
     def open(self, parent=None, detail_item=None, external=False):
-        google_analytics = '?utm_source=tdcalibre'
+        google_analytics = '?utm_source=tdcalibre&utm_medium=calibre'
         url = 'http://www.publio.pl/e-booki.html' + google_analytics
 
         if external or self.config.get('open_external', False):