diff --git a/ext/filter/tests/bug49510.phpt b/ext/filter/tests/bug49510.phpt
index 3f365cc4312..340c1ccd6b2 100644
--- a/ext/filter/tests/bug49510.phpt
+++ b/ext/filter/tests/bug49510.phpt
@@ -1,5 +1,7 @@
 --TEST--
-#49510	boolean validation fails with FILTER_NULL_ON_FAILURE
+Bug #49510	boolean validation fails with FILTER_NULL_ON_FAILURE
+--SKIPIF--
+<?php if (!extension_loaded("filter")) die("skip"); ?>
 --FILE--
 <?php
 var_dump(filter_var(false, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE));
diff --git a/ext/mbstring/tests/mb_str_functions_opt-parameter.phpt b/ext/mbstring/tests/mb_str_functions_opt-parameter.phpt
index 5fb642f9b2e..6219e585eb7 100644
--- a/ext/mbstring/tests/mb_str_functions_opt-parameter.phpt
+++ b/ext/mbstring/tests/mb_str_functions_opt-parameter.phpt
@@ -1,5 +1,7 @@
 --TEST--
 Optional long parameter might be null
+--SKIPIF--
+<?php extension_loaded('mbstring') or die('skip mbstring not available'); ?>
 --FILE--
 <?php
 echo mb_strpos('abb', 'b', null, 'UTF-8') . "\n";