diff --git a/tests/end-to-end/file-does-not-exist.phpt b/tests/end-to-end/file-does-not-exist.phpt
index f094b2b..b6ebac1 100644
--- a/tests/end-to-end/file-does-not-exist.phpt
+++ b/tests/end-to-end/file-does-not-exist.phpt
@@ -1,5 +1,9 @@
 --TEST--
 foal does-not-exist.php
+--SKIPIF--
+<?php declare(strict_types=1);
+if (!extension_loaded('Zend OPcache')) print 'skip: opcache not loaded' . PHP_EOL;
+if (!extension_loaded('vld')) print 'skip: vld not loaded' . PHP_EOL;
 --FILE--
 <?php declare(strict_types=1);
 namespace SebastianBergmann\FOAL\CLI;
diff --git a/tests/end-to-end/file-not-specified.phpt b/tests/end-to-end/file-not-specified.phpt
index f28c5d6..c418bcf 100644
--- a/tests/end-to-end/file-not-specified.phpt
+++ b/tests/end-to-end/file-not-specified.phpt
@@ -1,5 +1,9 @@
 --TEST--
 foal
+--SKIPIF--
+<?php declare(strict_types=1);
+if (!extension_loaded('Zend OPcache')) print 'skip: opcache not loaded' . PHP_EOL;
+if (!extension_loaded('vld')) print 'skip: vld not loaded' . PHP_EOL;
 --FILE--
 <?php declare(strict_types=1);
 namespace SebastianBergmann\FOAL\CLI;
diff --git a/tests/end-to-end/help.phpt b/tests/end-to-end/help.phpt
index ebc6173..ec787d2 100644
--- a/tests/end-to-end/help.phpt
+++ b/tests/end-to-end/help.phpt
@@ -1,5 +1,9 @@
 --TEST--
 foal --help
+--SKIPIF--
+<?php declare(strict_types=1);
+if (!extension_loaded('Zend OPcache')) print 'skip: opcache not loaded' . PHP_EOL;
+if (!extension_loaded('vld')) print 'skip: vld not loaded' . PHP_EOL;
 --FILE--
 <?php declare(strict_types=1);
 namespace SebastianBergmann\FOAL\CLI;
diff --git a/tests/end-to-end/version.phpt b/tests/end-to-end/version.phpt
index a657f4f..32b81aa 100644
--- a/tests/end-to-end/version.phpt
+++ b/tests/end-to-end/version.phpt
@@ -1,5 +1,9 @@
 --TEST--
 foal --version
+--SKIPIF--
+<?php declare(strict_types=1);
+if (!extension_loaded('Zend OPcache')) print 'skip: opcache not loaded' . PHP_EOL;
+if (!extension_loaded('vld')) print 'skip: vld not loaded' . PHP_EOL;
 --FILE--
 <?php declare(strict_types=1);
 namespace SebastianBergmann\FOAL\CLI;