diff --git a/main/inc/lib/main_api.lib.php b/main/inc/lib/main_api.lib.php
index dabfee555f..6820affa37 100755
--- a/main/inc/lib/main_api.lib.php
+++ b/main/inc/lib/main_api.lib.php
@@ -1537,7 +1537,7 @@ function api_format_course_array($course_data) {
     if (file_exists(api_get_path(SYS_COURSE_PATH).$course_data['directory'].'/course-pic85x85.png')) {
         $url_image = api_get_path(WEB_COURSE_PATH).$course_data['directory'].'/course-pic85x85.png';
     } else {
-        $url_image = api_get_path(WEB_IMG_PATH).'icons/64/course.png';
+        $url_image = api_get_path(WEB_IMG_PATH).'icons/'.ICON_SIZE_BIG.'/course.png';
     }
     $_course['course_image'] = $url_image;
     return $_course;
diff --git a/main/template/default/auth/courses_categories.php b/main/template/default/auth/courses_categories.php
index f59941f56a..bbbbbba870 100755
--- a/main/template/default/auth/courses_categories.php
+++ b/main/template/default/auth/courses_categories.php
@@ -243,7 +243,7 @@ function display_thumbnail($course, $icon_title)
     if (file_exists($course_path.'/course-pic85x85.png')) {
         $course_medium_image = api_get_path(WEB_COURSE_PATH).$course['directory'].'/course-pic85x85.png'; // redimensioned image 85x85
     } else {
-        $course_medium_image = api_get_path(WEB_IMG_PATH).'icons/64/course.png'; // without picture
+        $course_medium_image = api_get_path(WEB_IMG_PATH).'icons/'.ICON_SIZE_BIG.'/course.png'; // without picture
     }
 
     // course image