diff --git a/core/modules/jsonapi/src/JsonApiSpec.php b/core/modules/jsonapi/src/JsonApiSpec.php
index c59286f..6653250 100644
--- a/core/modules/jsonapi/src/JsonApiSpec.php
+++ b/core/modules/jsonapi/src/JsonApiSpec.php
@@ -97,7 +97,7 @@ public static function isValidMemberName($member_name) {
    *
    * @todo When D8 requires PHP >= 5.6, convert to an array.
    */
-  const RESERVED_QUERY_PARAMETERS = 'filter|sort|page|fields|include';
+  const RESERVED_QUERY_PARAMETERS = 'filter|sort|page|fields|include|q';
 
   /**
    * The query parameter for providing a version (revision) value.