diff --git a/calendar/lib.php b/calendar/lib.php
index b880ab5ee5b..0ab3790eb42 100644
--- a/calendar/lib.php
+++ b/calendar/lib.php
@@ -740,7 +740,7 @@ function calendar_filter_controls($type, $vars = NULL, $course = NULL) {
         $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showcourses'.$getvars.'" title="'.get_string('tt_hidecourse', 'calendar').'">'.get_string('courseevents', 'calendar').'</a></td>'."\n";
     }
     else {
-        $content .= '<td style="width: 11px;"><img src="'.$CFG->pixpath.'/t/hide.gif" class="iconsmall" alt="'.get_string('hide').'" /></td>';
+        $content .= '<td style="width: 11px;"><img src="'.$CFG->pixpath.'/t/show.gif" class="iconsmall" alt="'.get_string('hide').'" /></td>';
         $content .= '<td><a href="'.CALENDAR_URL.'set.php?var=showcourses'.$getvars.'" title="'.get_string('tt_showcourse', 'calendar').'">'.get_string('courseevents', 'calendar').'</a></td>'."\n";
     }