diff --git a/core/includes/config.inc b/core/includes/config.inc
index 00c7fa6..68123a7 100644
--- a/core/includes/config.inc
+++ b/core/includes/config.inc
@@ -141,11 +141,11 @@ function config_sync_get_changes(StorageInterface $source_storage, StorageInterf
     'delete' => array(),
   );
 
-  foreach (array_diff_assoc($target_config_data, $source_config_data) as $name => $value) {
+  foreach (array_diff_key($target_config_data, $source_config_data) as $name => $value) {
     $config_changes['delete'][] = $value['name'];
   }
 
-  foreach (array_diff_assoc($source_config_data, $target_config_data) as $name => $value) {
+  foreach (array_diff_key($source_config_data, $target_config_data) as $name => $value) {
     $config_changes['create'][] = $value['name'];
   }