diff -u b/modules/jsonapi_defaults/jsonapi_defaults.module b/modules/jsonapi_defaults/jsonapi_defaults.module
--- b/modules/jsonapi_defaults/jsonapi_defaults.module
+++ b/modules/jsonapi_defaults/jsonapi_defaults.module
@@ -85,7 +85,7 @@
   }
 
   if ($raw_value = $form_state->getValue('default_include')) {
-    $include = array_map('trim', preg_split('/\r\n?=\n/', $raw_value));
+    $include = array_map('trim', preg_split('/\r\n?|\n/', $raw_value));
     $include = array_filter($include);
     $config_resource->setThirdPartySetting('jsonapi_defaults', 'default_include', $include);
   }