diff --git a/review/simpletest/pifr_simpletest.client.inc b/review/simpletest/pifr_simpletest.client.inc
index 0271552..f76b03a 100644
--- a/review/simpletest/pifr_simpletest.client.inc
+++ b/review/simpletest/pifr_simpletest.client.inc
@@ -299,7 +299,7 @@ protected function findTestFiles($directory) {
       // '/Tests/' can be contained anywhere in the file's path (there can be
       // sub-directories below /Tests), but must be contained literally
       // (case-sensitive).
-      if (strpos($file->filename, '/Tests/')) {
+      if (strpos(strtolower($file->filename), '/tests/')) {
         $filename = str_replace($basedir, '', $file->filename);
         $files[$filename] = $filename;
       }