diff --git a/src/LiveComponent/src/ComponentWithFormTrait.php b/src/LiveComponent/src/ComponentWithFormTrait.php
index 1f6c180b5a..dbfe479e9b 100644
--- a/src/LiveComponent/src/ComponentWithFormTrait.php
+++ b/src/LiveComponent/src/ComponentWithFormTrait.php
@@ -277,7 +277,7 @@ private function extractFormValues(FormView $formView): array
                 )
                 && !$child->vars['expanded']                // is a <select>     (not a radio/checkbox)
                 && !$child->vars['multiple']                // is not multiple
-                && !is_string($child->vars['placeholder'])  // has no placeholder (empty string is valid)
+                && !\is_string($child->vars['placeholder'])  // has no placeholder (empty string is valid)
             ) {
                 $choices = $child->vars['choices'];
                 do {