diff --git a/tests/src/Kernel/BackendTestBase.php b/tests/src/Kernel/BackendTestBase.php
index adb91c9..8aa66ed 100644
--- a/tests/src/Kernel/BackendTestBase.php
+++ b/tests/src/Kernel/BackendTestBase.php
@@ -836,6 +836,7 @@ abstract class BackendTestBase extends KernelTestBase {
     $this->regressionTest1916474();
     $this->regressionTest2284199();
     $this->regressionTest2471509();
+    $this->regressionTest2616804();
   }
 
   /**
@@ -933,7 +934,11 @@ abstract class BackendTestBase extends KernelTestBase {
    *
    * @see https://www.drupal.org/node/2616804
    */
-  protected function regressionTests2616804() {
+  protected function regressionTest2616804() {
+    $index = $this->getIndex();
+    $this->addField($index, 'body');
+    $index->save();
+
     // The word has 28 Unicode characters but 56 bytes. Verify that it is still
     // indexed correctly.
     $mb_word = 'äöüßáŧæøðđŋħĸµäöüßáŧæøðđŋħĸµ';