diff --git a/renderer/book.php b/renderer/book.php
index e431043..286d32e 100644
--- a/renderer/book.php
+++ b/renderer/book.php
@@ -128,7 +128,7 @@ function internallink($id, $name = NULL, $returnonly = false) {
         $name = $this->_getLinkTitle($name, $default, $isImage, $id);
 
         // build the absolute URL (keeping a hash if any)
-        list($id,$hash) = explode('#',$id,2);
+        list($id,$hash) = sexplode('#',$id,2);
 
         // Is the link a link to a page included in the book?
         $pages = $this->actioninstance->getExportedPages();