diff --git a/course/format/classes/output/local/content/section/availability.php b/course/format/classes/output/local/content/section/availability.php
index c3c6bab636c..eb64d159662 100644
--- a/course/format/classes/output/local/content/section/availability.php
+++ b/course/format/classes/output/local/content/section/availability.php
@@ -209,7 +209,7 @@ class availability implements named_templatable, renderable {
         $text = info::format_info($availabilityinfo, $course);
         $data = ['text' => $text];
 
-        if (strlen(html_to_text($text)) > self::AVAILABILITY_EXCERPT_MAXSIZE) {
+        if (strlen(html_to_text($text, 0, false)) > self::AVAILABILITY_EXCERPT_MAXSIZE) {
             $data['excerpt'] = shorten_text($text, self::AVAILABILITY_EXCERPT_MAXSIZE);
         }