diff --git a/grafana_api/api/annotations.py b/grafana_api/api/annotations.py
index ddf2d38..d656d06 100644
--- a/grafana_api/api/annotations.py
+++ b/grafana_api/api/annotations.py
@@ -52,10 +52,10 @@ def get_annotation(
             params.append("panelId=%s" % panel_id)
 
         if user_id:
-            params.append("userId=%s", user_id)
+            params.append("userId=%s" % user_id)
 
         if ann_type:
-            params.append("type=%s", ann_type)
+            params.append("type=%s" % ann_type)
 
         if tags:
             for tag in tags: