diff --git a/code/Forms/UploadField.php b/code/Forms/UploadField.php
index 3417880ee..2f235b368 100644
--- a/code/Forms/UploadField.php
+++ b/code/Forms/UploadField.php
@@ -288,8 +288,6 @@ public function getAttributes()
             'type' => 'file',
             'multiple' => $this->getIsMultiUpload(),
             'id' => $this->ID(),
-            'data-schema' => json_encode($this->getSchemaData()),
-            'data-state' => json_encode($this->getSchemaState()),
         );
 
         $attributes = array_merge($attributes, $this->attributes);
diff --git a/templates/SilverStripe/AssetAdmin/Forms/UploadField.ss b/templates/SilverStripe/AssetAdmin/Forms/UploadField.ss
index 0868a5074..02e850c46 100644
--- a/templates/SilverStripe/AssetAdmin/Forms/UploadField.ss
+++ b/templates/SilverStripe/AssetAdmin/Forms/UploadField.ss
@@ -7,4 +7,4 @@
         </div>
     <% end_if %>
 </div>
-<input $AttributesHTML <% include SilverStripe/Forms/AriaAttributes %> />
+<input $AttributesHTML <% include SilverStripe/Forms/AriaAttributes %> data-schema="$SchemaData.JSON" data-state="$SchemaState.JSON" />