diff --git a/ObjectHelper.inc b/ObjectHelper.inc
index 0d161b23..5928bd10 100644
--- a/ObjectHelper.inc
+++ b/ObjectHelper.inc
@@ -500,7 +500,7 @@ class ObjectHelper {
     }
     $content .= $addObject;
 
-    return '<div class="fedora_datastream_content">' . $content . '</div>';
+    return '<div class="fedora-datastream-content">' . $content . '</div>';
   }