diff --git a/linkml_model/model/schema/extensions.yaml b/linkml_model/model/schema/extensions.yaml
index b015dcae..6d5fd2d5 100644
--- a/linkml_model/model/schema/extensions.yaml
+++ b/linkml_model/model/schema/extensions.yaml
@@ -38,6 +38,8 @@ slots:
     alias: value
     required: true
     range: AnyValue
+    annotations:
+      simple_dict_value: true
 
 
 classes: