diff --git a/includes/CategoryTree.php b/includes/CategoryTree.php
index 077a938a..820e6f44 100644
--- a/includes/CategoryTree.php
+++ b/includes/CategoryTree.php
@@ -92,7 +92,6 @@ class CategoryTree {
 			$attr['class'] = 'CategoryTreeTag';
 		}
 
-		$attr['data-ct-mode'] = $this->optionManager->getOption( 'mode' );
 		$attr['data-ct-options'] = $this->optionManager->getOptionsAsJsStructure();
 
 		if ( !$title->getArticleID() ) {
diff --git a/includes/CategoryTreePage.php b/includes/CategoryTreePage.php
index 8846a288..16708404 100644
--- a/includes/CategoryTreePage.php
+++ b/includes/CategoryTreePage.php
@@ -193,7 +193,6 @@ class CategoryTreePage extends SpecialPage {
 		$output->addHTML( Html::rawElement( 'div',
 			[
 				'class' => 'CategoryTreeResult CategoryTreeTag',
-				'data-ct-mode' => $this->tree->optionManager->getOption( 'mode' ),
 				'data-ct-options' => $this->tree->optionManager->getOptionsAsJsStructure(),
 			],
 			$this->tree->renderNode( $title, 1 )
diff --git a/modules/ext.categoryTree/ext.categoryTree.js b/modules/ext.categoryTree/ext.categoryTree.js
index 7a1b6b9e..1aace12f 100644
--- a/modules/ext.categoryTree/ext.categoryTree.js
+++ b/modules/ext.categoryTree/ext.categoryTree.js
@@ -143,9 +143,8 @@ function loadChildren( $link, $children ) {
 	// Element may not have a .CategoryTreeTag parent, fallback to defauls
 	// Probably a CategoryPage (@todo: based on what?)
 	const ctTitle = $link.attr( 'data-ct-title' );
-	const ctMode = $linkParentCTTag.data( 'ct-mode' );
-	const mode = typeof ctMode === 'number' ? ctMode : undefined;
 	const ctOptions = $linkParentCTTag.attr( 'data-ct-options' ) || config.defaultCtOptions;
+	const mode = JSON.parse( ctOptions ).mode;
 
 	// Mode and options have defaults or fallbacks, title does not.
 	// Don't make a request if there is no title.