diff --git a/src/Component/SimpleTreeLinkNode.php b/src/Component/SimpleTreeLinkNode.php
index ddc8537..6e52a03 100644
--- a/src/Component/SimpleTreeLinkNode.php
+++ b/src/Component/SimpleTreeLinkNode.php
@@ -17,7 +17,7 @@ public function __construct( array $options = [] ) {
 			'id' => 'some-id',
 			'items' => [],
 			'classes' => [],
-			'role' => 'tree-item',
+			'role' => 'treeitem',
 			'text' => '',
 			'title' => '',
 			'href' => '',
diff --git a/src/Component/SimpleTreeTextNode.php b/src/Component/SimpleTreeTextNode.php
index e3ecc5e..450116e 100644
--- a/src/Component/SimpleTreeTextNode.php
+++ b/src/Component/SimpleTreeTextNode.php
@@ -17,7 +17,7 @@ public function __construct( array $options = [] ) {
 			'id' => 'some-id',
 			'items' => [],
 			'classes' => [],
-			'role' => 'tree-item',
+			'role' => 'treeitem',
 			'text' => '',
 			'expanded' => false,
 		], $options );