diff --git a/run-tests.php b/run-tests.php
index 634beffa533..68d2cb69256 100755
--- a/run-tests.php
+++ b/run-tests.php
@@ -859,7 +859,7 @@ More .INIs  : " , (function_exists(\'php_ini_scanned_files\') ? str_replace("\n"
         $exts = get_loaded_extensions();
         $ext_dir = ini_get('extension_dir');
         foreach (scandir($ext_dir) as $file) {
-            if (preg_match('/^(?:php_)?([_a-zA-Z0-9]+)\.(?:so|dll)$/', $file, $matches)) {
+            if (preg_match('/^(?:php_)?([_a-zA-Z0-9]+)\.(?:' . PHP_SHLIB_SUFFIX . ')$/', $file, $matches)) {
                 if (!extension_loaded($matches[1])) {
                     $exts[] = $matches[1];
                 }