diff --git a/lib.php b/lib.php
index 6182a55..ed02d04 100644
--- a/lib.php
+++ b/lib.php
@@ -18,6 +18,7 @@ function expcontent_update_instance($expcontent) {
 
     $expcontent->timemodified = time();
     $expcontent->id = $expcontent->instance;
+    $expcontent->introformat = FORMAT_MOODLE;
 
     if (! $DB->update_record('expcontent', $expcontent)) {
         return false;