diff --git a/lib/classes/update/code_manager.php b/lib/classes/update/code_manager.php
index 9eac43bf937..3493ad427fb 100644
--- a/lib/classes/update/code_manager.php
+++ b/lib/classes/update/code_manager.php
@@ -328,7 +328,7 @@ class code_manager {
             if ($fileinfo->getFilename() === '..') {
                 continue;
             }
-            if (strpos($fileinfo->getRealPath(), $folderpathinfo->getRealPath() !== 0)) {
+            if (strpos($fileinfo->getRealPath(), $folderpathinfo->getRealPath()) !== 0) {
                 throw new moodle_exception('unexpected_filepath_mismatch', 'core_plugin');
             }
             $key = substr($fileinfo->getRealPath(), $strip);