diff --git a/includes/sanitizers/class-amp-core-theme-sanitizer.php b/includes/sanitizers/class-amp-core-theme-sanitizer.php
index 83069132838..8518f8d3db8 100644
--- a/includes/sanitizers/class-amp-core-theme-sanitizer.php
+++ b/includes/sanitizers/class-amp-core-theme-sanitizer.php
@@ -1594,7 +1594,7 @@ public function wrap_modal_in_lightbox( $args = [] ) {
 	public function add_twentytwenty_modals() {
 		$modals = $this->xpath->query( "//*[ @class and contains( concat( ' ', normalize-space( @class ), ' ' ), ' cover-modal ' ) ]" );
 
-		if ( false === $modals || 0 === $modals->count() ) {
+		if ( false === $modals || 0 === $modals->length ) {
 			return;
 		}
 
@@ -1672,7 +1672,7 @@ public function add_twentytwenty_toggles() {
 		$toggles = $this->xpath->query( '//*[ @data-toggle-target ]' );
 		$body_id = AMP_DOM_Utils::get_element_id( $this->get_body_node(), 'body' );
 
-		if ( false === $toggles || 0 === $toggles->count() ) {
+		if ( false === $toggles || 0 === $toggles->length ) {
 			return;
 		}