diff --git a/addon/serializers/osf-serializer.js b/addon/serializers/osf-serializer.js
index <HASH>..<HASH> 100644
--- a/addon/serializers/osf-serializer.js
+++ b/addon/serializers/osf-serializer.js
@@ -68,6 +68,7 @@ export default DS.JSONAPISerializer.extend({
 
     serialize: function(snapshot, options) {
         var serialized = this._super(snapshot, options);
+        serialized.data.type = Ember.String.underscore(serialized.data.type);
         // Don't send relationships to the server; this can lead to 500 errors.
         delete serialized.data.relationships;
         return serialized;
Change serialized data type to underscore version of type.