diff --git a/src/UpdateScripts/UpdateGlobalVariables.php b/src/UpdateScripts/UpdateGlobalVariables.php
index 8fe0755f904..6fb734012e2 100644
--- a/src/UpdateScripts/UpdateGlobalVariables.php
+++ b/src/UpdateScripts/UpdateGlobalVariables.php
@@ -38,15 +38,19 @@ public function update()
      */
     private function buildSitesArray(): void
     {
-        GlobalSet::all()->each(function ($globalSet) {
+        $siteOrder = Site::all()->keys()->flip();
+
+        GlobalSet::all()->each(function ($globalSet) use ($siteOrder) {
             $variables = GlobalVariables::whereSet($globalSet->handle());
 
-            $sites = $variables->mapWithKeys(function ($variable) {
-                $contents = YAML::file($variable->path())->parse();
-                $origin = Arr::get($contents, 'origin');
+            $sites = $variables
+                ->sortBy(fn ($variable) => $siteOrder->get($variable->locale(), $siteOrder->count()))
+                ->mapWithKeys(function ($variable) {
+                    $contents = YAML::file($variable->path())->parse();
+                    $origin = Arr::get($contents, 'origin');
 
-                return [$variable->locale() => $origin];
-            });
+                    return [$variable->locale() => $origin];
+                });
 
             $globalSet->sites($sites)->save();
 
diff --git a/tests/UpdateScripts/UpdateGlobalVariablesTest.php b/tests/UpdateScripts/UpdateGlobalVariablesTest.php
index 9d74711bc03..fcde4ecf478 100644
--- a/tests/UpdateScripts/UpdateGlobalVariablesTest.php
+++ b/tests/UpdateScripts/UpdateGlobalVariablesTest.php
@@ -120,9 +120,12 @@ public function it_builds_the_sites_array_in_a_multi_site_install()
         File::ensureDirectoryExists($this->globalsPath.'/de');
 
         File::put($this->globalsPath.'/test.yaml', Yaml::dump(['title' => 'Test']));
-        File::put($this->globalsPath.'/en/test.yaml', Yaml::dump(['foo' => 'Bar', 'baz' => 'Qux']));
-        File::put($this->globalsPath.'/fr/test.yaml', Yaml::dump(['origin' => 'en', 'foo' => 'Bar']));
+
+        // Written out of order on purpose. The Stache indexes variables by modification
+        // time, but the sites array should follow the order of the sites config.
         File::put($this->globalsPath.'/de/test.yaml', Yaml::dump(['origin' => 'fr']));
+        File::put($this->globalsPath.'/fr/test.yaml', Yaml::dump(['origin' => 'en', 'foo' => 'Bar']));
+        File::put($this->globalsPath.'/en/test.yaml', Yaml::dump(['foo' => 'Bar', 'baz' => 'Qux']));
 
         $this->runUpdateScript(UpdateGlobalVariables::class);
 
@@ -130,9 +133,9 @@ public function it_builds_the_sites_array_in_a_multi_site_install()
         $expected = <<<'YAML'
 title: Test
 sites:
-  de: fr
   en: null
   fr: en
+  de: fr
 
 YAML;