diff --git a/islandora_fits.install b/islandora_fits.install
index ed5eb99f..37d071a0 100644
--- a/islandora_fits.install
+++ b/islandora_fits.install
@@ -32,5 +32,6 @@ function islandora_fits_install() {
   if (!strpos($extensions, 'xml')) {
     $fieldSettings['file_extensions'] .= ' xml';
     $field->set('settings', $fieldSettings);
+    $field->save();
   }
 }