diff --git a/core/modules/system/system.post_update.php b/core/modules/system/system.post_update.php
index cc6d229d39..ed1ab754f7 100644
--- a/core/modules/system/system.post_update.php
+++ b/core/modules/system/system.post_update.php
@@ -225,7 +225,7 @@ function system_post_update_entity_reference_autocomplete_match_limit(&$sandbox
 
   $callback = function (EntityDisplayInterface $display) use ($field_widget_manager) {
     $needs_save = FALSE;
-    foreach ($display->getComponents() as $field_name => $component) {
+    foreach ($display->getComponents() as $component) {
       if (empty($component['type'])) {
         continue;
       }