diff --git a/core/lib/Drupal/Core/Menu/StaticMenuLinkOverrides.php b/core/lib/Drupal/Core/Menu/StaticMenuLinkOverrides.php
index fbde872..0ef652b 100644
--- a/core/lib/Drupal/Core/Menu/StaticMenuLinkOverrides.php
+++ b/core/lib/Drupal/Core/Menu/StaticMenuLinkOverrides.php
@@ -136,7 +136,11 @@ public function saveOverride($id, array $definition) {
     if ($definition) {
       $all_overrides = $this->getConfig()->get('definitions');
       // Combine with any existing data.
-      $all_overrides[static::encodeId($id)] = $definition + $this->loadOverride($id);
+      $new_definition = $definition + $this->loadOverride($id);
+      // Sort by key to may config diffs more sensible.
+      ksort($new_definition);
+      $all_overrides[static::encodeId($id)] = $new_definition;
+      ksort($all_overrides);
       $this->getConfig()->set('definitions', $all_overrides)->save();
     }
     return array_keys($definition);