diff --git a/src/Autocomplete/src/Form/AutocompleteChoiceTypeExtension.php b/src/Autocomplete/src/Form/AutocompleteChoiceTypeExtension.php
index 149805e99e6..51c897e76b9 100644
--- a/src/Autocomplete/src/Form/AutocompleteChoiceTypeExtension.php
+++ b/src/Autocomplete/src/Form/AutocompleteChoiceTypeExtension.php
@@ -55,7 +55,7 @@ public function finishView(FormView $view, FormInterface $form, array $options):
         $attr = $view->vars['attr'] ?? [];
 
         $controllerName = 'symfony--ux-autocomplete--autocomplete';
-        $attr['data-controller'] = trim(($attr['data-controller'] ?? '').' '.$controllerName);
+        $attr['data-controller'] = $controllerName.' '.trim($attr['data-controller'] ?? '');
 
         $values = [];
         if ($options['autocomplete_url']) {
diff --git a/src/Autocomplete/tests/Functional/AutocompleteFormRenderingTest.php b/src/Autocomplete/tests/Functional/AutocompleteFormRenderingTest.php
index 92c7695c98c..c149833034a 100644
--- a/src/Autocomplete/tests/Functional/AutocompleteFormRenderingTest.php
+++ b/src/Autocomplete/tests/Functional/AutocompleteFormRenderingTest.php
@@ -30,7 +30,7 @@ public function testFieldsRenderWithStimulusController()
         $this->browser()
             ->throwExceptions()
             ->get('/test-form')
-            ->assertElementAttributeContains('#product_category', 'data-controller', 'custom-autocomplete symfony--ux-autocomplete--autocomplete')
+            ->assertElementAttributeContains('#product_category', 'data-controller', 'symfony--ux-autocomplete--autocomplete custom-autocomplete')
             ->assertElementAttributeContains('#product_category', 'data-symfony--ux-autocomplete--autocomplete-url-value', '/test/autocomplete/category_autocomplete_type?extra_options=')
             ->assertElementAttributeContains('#product_category', 'data-symfony--ux-autocomplete--autocomplete-min-characters-value', '2')
             ->assertElementAttributeContains('#product_category', 'data-symfony--ux-autocomplete--autocomplete-max-results-value', '25')