diff --git a/lib/classes/plugininfo/base.php b/lib/classes/plugininfo/base.php
index 4eb39a1b188..41f5557fb60 100644
--- a/lib/classes/plugininfo/base.php
+++ b/lib/classes/plugininfo/base.php
@@ -598,7 +598,7 @@ abstract class base {
     public function get_dir() {
         global $CFG;
 
-        if (!isset($pluginfo->rootdir)) {
+        if (!isset($this->rootdir)) {
             return '';
         }