diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index 963f64a54dd..e6d8d0484a1 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -7054,7 +7054,7 @@ function get_list_of_plugins($directory='mod', $exclude='', $basedir='') {
         $dirhandle = opendir($basedir);
         while (false !== ($dir = readdir($dirhandle))) {
             $firstchar = substr($dir, 0, 1);
-            if ($firstchar == '.' or $dir == 'CVS' or $dir == '_vti_cnf' or $dir == 'simpletest' or $dir == 'yui' or $dir == 'phpunit' or $dir == $exclude) {
+            if ($firstchar === '.' or $dir === 'CVS' or $dir === '_vti_cnf' or $dir === 'simpletest' or $dir === 'yui' or $dir === 'phpunit' or $dir === $exclude) {
                 continue;
             }
             if (filetype($basedir .'/'. $dir) != 'dir') {