diff --git a/src/Chamilo/CourseBundle/Component/CourseCopy/CourseArchiver.php b/src/Chamilo/CourseBundle/Component/CourseCopy/CourseArchiver.php
index 2270a1d3325..59c0861c9fe 100644
--- a/src/Chamilo/CourseBundle/Component/CourseCopy/CourseArchiver.php
+++ b/src/Chamilo/CourseBundle/Component/CourseCopy/CourseArchiver.php
@@ -307,10 +307,10 @@ public static function readCourse($filename, $delete = false)
         $zip = new \PclZip($unzip_dir.'/backup.zip');
         @chdir($unzip_dir);
 
+        // For course backups we must preserve original filenames so that
+        // paths in course_info.dat still match the files in backup_path.
         $zip->extract(
-            PCLZIP_OPT_TEMP_FILE_ON,
-            PCLZIP_CB_PRE_EXTRACT,
-            'clean_up_files_in_zip'
+            PCLZIP_OPT_TEMP_FILE_ON
         );
 
         // remove the archive-file