diff --git a/islandora.api.php b/islandora.api.php
index 18e5643b..0dff8d89 100644
--- a/islandora.api.php
+++ b/islandora.api.php
@@ -394,8 +394,17 @@ function hook_islandora_viewer_info() {
 
 /**
  * Returns a list of datastreams that are determined to be undeletable.
+ *
+ * The list is used to prevent delete links from being shown.
+ *
+ * @param array $models
+ *   An array of content models for the current object.
+ *
+ * @return array
+ *   An array of DSIDs that shouldn't be deleted.
  */
 function hook_islandora_undeletable_datastreams(array $models) {
+  return array('DC', 'MODS');
 }
 
 /**
diff --git a/islandora.module b/islandora.module
index 45458665..ebf7f916 100644
--- a/islandora.module
+++ b/islandora.module
@@ -1237,10 +1237,10 @@ function islandora_islandora_required_objects(IslandoraTuque $connection) {
 }
 
 /**
- * Implements islandora_undeleteable_datastreams().
+ * Implements hook_islandora_undeleteable_datastreams().
  */
 function islandora_islandora_undeletable_datastreams(array $models) {
-  return array('DC');
+  return array('DC', 'RELS-EXT');
 }
 
 /**