diff --git a/course/import/activities/mod.php b/course/import/activities/mod.php
index 0a4776142b1..5b13cf41b2c 100644
--- a/course/import/activities/mod.php
+++ b/course/import/activities/mod.php
@@ -21,7 +21,7 @@
     if ($teachers = get_user_capability_course('moodle/course:edit')) {
         foreach ($teachers as $teacher) {
             if ($teacher->id != $course->id && $teacher->id != SITEID){
-                $tcourseids .= $teacher->id',';
+                $tcourseids .= $teacher->id.',';
             }
         }
     }