diff --git a/main/document/document.php b/main/document/document.php
index b9bbfe6753..d1ca27d3ce 100755
--- a/main/document/document.php
+++ b/main/document/document.php
@@ -652,7 +652,7 @@ if (isset($_GET['curdirpath']) &&
             $new_content_html
         );
         $new_content_html = str_replace(
-            '/main/img/',
+            SYS_CODE_PATH . 'img/',
             api_get_path(WEB_IMG_PATH),
             $new_content_html
         );
diff --git a/main/gradebook/lib/gradebook_functions.inc.php b/main/gradebook/lib/gradebook_functions.inc.php
index 8770f3b1fe..c5d835ffe5 100755
--- a/main/gradebook/lib/gradebook_functions.inc.php
+++ b/main/gradebook/lib/gradebook_functions.inc.php
@@ -676,7 +676,7 @@ function get_user_certificate_content($user_id, $course_code, $is_preview = fals
 
     $path_image_in_default_course = api_get_path(WEB_CODE_PATH) . 'default_course_document';
     $new_content_html = str_replace('/main/default_course_document', $path_image_in_default_course, $new_content_html);
-    $new_content_html = str_replace('/main/img/', api_get_path(WEB_IMG_PATH), $new_content_html);
+    $new_content_html = str_replace(SYS_CODE_PATH . 'img/', api_get_path(WEB_IMG_PATH), $new_content_html);
 
     //add print header
     if ($hide_print_button == false) {