diff --git a/tests/Standards/AbstractSniffUnitTest.php b/tests/Standards/AbstractSniffUnitTest.php
index 78699a7639..5d93536d0b 100644
--- a/tests/Standards/AbstractSniffUnitTest.php
+++ b/tests/Standards/AbstractSniffUnitTest.php
@@ -88,7 +88,7 @@ protected function getTestFiles($testFileBase)
         }
 
         // Put them in order.
-        sort($testFiles);
+        sort($testFiles, SORT_NATURAL);
 
         return $testFiles;