diff --git a/includes/article.php b/includes/article.php
index 3a62342..9b23e54 100644
--- a/includes/article.php
+++ b/includes/article.php
@@ -80,6 +80,11 @@ function dynamiques_render_article_inject_ids_to_headings($content)
 			$slug = 'anchor';
 		}
 
+		// Ajouter un préfixe si l'ancre commence par un chiffre
+		if (preg_match('/^[0-9]/', $slug)) {
+			$slug = 'anchor-' . $slug;
+		}
+
 		return $slug;
 	}
 
diff --git a/includes/utilities.php b/includes/utilities.php
index 1bf8d69..e89646e 100644
--- a/includes/utilities.php
+++ b/includes/utilities.php
@@ -120,6 +120,12 @@ function build_sommaire_from_content($postID)
 
 		$anchor = $block['attrs']['idName'] ?? sanitize_title($title);
 
+		// Ajouter un préfixe si l'ancre commence par un chiffre
+		if (!empty($anchor) && preg_match('/^[0-9]/', $anchor)) {
+			$anchor = 'anchor-' . $anchor;
+		}
+
+
 		$outputIndex[] = [
 			'title' => $title,
 			'anchor' => $anchor,
@@ -183,3 +189,31 @@ function apply_footnotes_urls_to_content($content)
 
 	return $dom->saveHTML();
 }
+
+// Endpoint AJAX pour sanitize_title
+add_action('wp_ajax_sanitize_title_ajax', 'sanitize_title_ajax_handler');
+add_action('wp_ajax_nopriv_sanitize_title_ajax', 'sanitize_title_ajax_handler');
+
+function sanitize_title_ajax_handler()
+{
+	// Vérifier le nonce pour la sécurité
+	if (!wp_verify_nonce($_POST['nonce'], 'sanitize_title_nonce')) {
+		wp_die('Erreur de sécurité');
+	}
+
+	$title = sanitize_text_field($_POST['title']);
+	$sanitized_title = sanitize_title($title);
+
+	wp_send_json_success(array('sanitized_title' => $sanitized_title));
+}
+
+// Ajouter le script et les variables localisées
+add_action('wp_enqueue_scripts', 'add_sanitize_title_script');
+
+function add_sanitize_title_script()
+{
+	wp_localize_script('jquery', 'sanitize_title_ajax', array(
+		'ajax_url' => admin_url('admin-ajax.php'),
+		'nonce' => wp_create_nonce('sanitize_title_nonce')
+	));
+}