diff --git a/wp-includes/query.php b/wp-includes/query.php
index afa38f3af..5395f3b1b 100644
--- a/wp-includes/query.php
+++ b/wp-includes/query.php
@@ -2865,7 +2865,7 @@ function setup_postdata($post) {
 		$pages = explode('<!--nextpage-->', $content);
 		$numpages = count($pages);
 	} else {
-		$pages[0] = $post->post_content;
+		$pages = array( $post->post_content );
 		$multipage = 0;
 	}