diff --git a/src/TwigComponent/src/ComponentAttributes.php b/src/TwigComponent/src/ComponentAttributes.php
index 82f9a5cdd41..bd4029145e2 100644
--- a/src/TwigComponent/src/ComponentAttributes.php
+++ b/src/TwigComponent/src/ComponentAttributes.php
@@ -80,7 +80,7 @@ public function __toString(): string
             //      xml:*, xmlns:*,
             // - special syntax names (Vue.js, Svelte, Alpine.js, ...)
             //      v-*, x-*, @*, :*
-            if (!ctype_alpha(str_replace(['-', '_', ':', '@', '.'], '', $key))) {
+            if (!ctype_alnum(str_replace(['-', '_', ':', '@', '.'], '', $key))) {
                 $key = (string) $this->escaper->escape($key, 'html_attr');
             }
 
diff --git a/src/TwigComponent/tests/Unit/ComponentAttributesTest.php b/src/TwigComponent/tests/Unit/ComponentAttributesTest.php
index 377822c3118..255364ca48e 100644
--- a/src/TwigComponent/tests/Unit/ComponentAttributesTest.php
+++ b/src/TwigComponent/tests/Unit/ComponentAttributesTest.php
@@ -324,6 +324,7 @@ public static function provideSpecialSyntaxAttributeNames(): iterable
         yield ['@click'];
         // Alpine.js
         yield ['x-on:click'];
+        yield ['@input.debounce.500ms'];
     }
 
     public function testThrowsTypeErrorWithoutEscaperRuntime(): void