diff --git a/src/ralph/dashboards/admin.py b/src/ralph/dashboards/admin.py
index 4d3041873f..6aa8ab04f6 100644
--- a/src/ralph/dashboards/admin.py
+++ b/src/ralph/dashboards/admin.py
@@ -29,7 +29,7 @@ def keyfunc(x):
         ))
 
         self.initial['params'] = json.dumps(
-            self.initial.get('params', '{}'),
+            self.initial.get('params', {}),
             indent=4
         )