diff --git a/mod/chat/lib.php b/mod/chat/lib.php
index 16f68a3408e..c9bb3089392 100644
--- a/mod/chat/lib.php
+++ b/mod/chat/lib.php
@@ -327,7 +327,7 @@ function chat_print_recent_activity($course, $viewfullnames, $timestart) {
     $strftimerecent = get_string('strftimerecent');
 
     if ($past) {
-        echo $OUTPUT->heading(get_string("pastchats", 'chat').':');
+        echo $OUTPUT->heading(get_string("pastchats", 'chat').':', 3);
 
         foreach ($past as $cm) {
             $link = $CFG->wwwroot.'/mod/chat/view.php?id='.$cm->id;
@@ -338,7 +338,7 @@ function chat_print_recent_activity($course, $viewfullnames, $timestart) {
     }
 
     if ($current) {
-        echo $OUTPUT->heading(get_string("currentchats", 'chat').':');
+        echo $OUTPUT->heading(get_string("currentchats", 'chat').':', 3);
 
         $oldest = floor((time()-$CFG->chat_old_ping)/10)*10;  // better db caching