diff --git a/ext/posix/tests/posix_kill_pidoverflow.phpt b/ext/posix/tests/posix_kill_pidoverflow.phpt
index d86b8c4da3bb2..0e8b8c7b7df12 100644
--- a/ext/posix/tests/posix_kill_pidoverflow.phpt
+++ b/ext/posix/tests/posix_kill_pidoverflow.phpt
@@ -2,6 +2,7 @@
 posix_kill() with large pid
 --EXTENSIONS--
 posix
+pcntl
 --SKIPIF--
 <?php if (PHP_INT_SIZE != 8) die("skip this test is for 64bit platform only"); ?>
 --FILE--