diff --git a/includes/frontend/widgets/class-posts-widget.php b/includes/frontend/widgets/class-posts-widget.php
index 97799a2..1dc228e 100644
--- a/includes/frontend/widgets/class-posts-widget.php
+++ b/includes/frontend/widgets/class-posts-widget.php
@@ -252,7 +252,7 @@ public function widget( $args, $instance ) {
 		global $post;
 
 		if ( ! isset( $args['widget_id'] ) ) {
-			$args['widget_id'] = (int) $this->id;
+			$args['widget_id'] = (string) $this->id;
 		}
 
 		if ( Display::exclude_on( $post, $args ) ) {