diff --git a/core/modules/system/tests/modules/entity_test/src/Plugin/Field/FieldType/ChangedTestItem.php b/core/modules/system/tests/modules/entity_test/src/Plugin/Field/FieldType/ChangedTestItem.php
index 770f222..f429b39 100644
--- a/core/modules/system/tests/modules/entity_test/src/Plugin/Field/FieldType/ChangedTestItem.php
+++ b/core/modules/system/tests/modules/entity_test/src/Plugin/Field/FieldType/ChangedTestItem.php
@@ -35,7 +35,8 @@ public function preSave() {
       // change the entity with the original language at the beginning of the
       // second. Comply with this requirement on real sites do not need to.
       if ($this->getEntity()->language()->isDefault()) {
-        time_sleep_until ( time() + 1 );
+        // Wait 1.1 second's, because time_sleep_until works not very accurate.
+        time_sleep_until(time() + 1.1);
       }
       $this->value = time();
     }