diff --git a/backup/converter/imscc1/lib.php b/backup/converter/imscc1/lib.php
index 10476d01752..ed4d811b902 100644
--- a/backup/converter/imscc1/lib.php
+++ b/backup/converter/imscc1/lib.php
@@ -37,9 +37,10 @@ class imscc1_converter extends base_converter {
      * @return null|string backup::FORMAT_IMSCC1 if the Common Cartridge 1.0 is detected, null otherwise
      */
     public static function detect_format($tempdir) {
-        global $CFG;
-
-        $filepath = $CFG->dataroot . '/temp/backup/' . $tempdir;
+        $filepath = make_backup_temp_directory($tempdir, false);
+        if (!is_dir($filepath)) {
+            throw new convert_helper_exception('tmp_backup_directory_not_found', $filepath);
+        }
         $manifest = cc2moodle::get_manifest($filepath);
         if (!empty($manifest)) {
             // Looks promising, lets load some information.
diff --git a/backup/converter/imscc11/lib.php b/backup/converter/imscc11/lib.php
index 0c1c6d6202c..56532fa8696 100644
--- a/backup/converter/imscc11/lib.php
+++ b/backup/converter/imscc11/lib.php
@@ -38,9 +38,10 @@ class imscc11_converter extends base_converter {
      * @return null|string backup::FORMAT_IMSCC11 if the Common Cartridge 1.1 is detected, null otherwise
      */
     public static function detect_format($tempdir) {
-        global $CFG;
-
-        $filepath = $CFG->dataroot . '/temp/backup/' . $tempdir;
+        $filepath = make_backup_temp_directory($tempdir, false);
+        if (!is_dir($filepath)) {
+            throw new convert_helper_exception('tmp_backup_directory_not_found', $filepath);
+        }
         $manifest = cc112moodle::get_manifest($filepath);
         if (file_exists($manifest)) {
             // Looks promising, lets load some information.