diff --git a/src/ctia/entity/event.clj b/src/ctia/entity/event.clj
index 009e89857c..86c933d9bf 100644
--- a/src/ctia/entity/event.clj
+++ b/src/ctia/entity/event.clj
@@ -26,6 +26,7 @@
      :timestamp   em/ts
      :entity      {:type "object"
                    :properties {:id em/token
+                                :type em/token
                                 :source_ref em/token
                                 :target_ref em/token}}
      :id          em/token