diff --git a/demos/hello_wolf/yaml/hello_wolf_config.yaml b/demos/hello_wolf/yaml/hello_wolf_config.yaml
index 628f84acd19f640e1b09f3e382bb508e5c1fb1c7..b0eea06960149ef9a26213f186a122b76767b6f0 100644
--- a/demos/hello_wolf/yaml/hello_wolf_config.yaml
+++ b/demos/hello_wolf/yaml/hello_wolf_config.yaml
@@ -17,9 +17,11 @@ config:
 
     tree_manager:
       type: "none"
+      plugin: "core"
   
   map:
     type: "MapBase"
+    plugin: "core"
   
   solver:
     max_num_iterations: 100