diff --git a/ext/openssl/tests/openssl_error_string_basic.phpt b/ext/openssl/tests/openssl_error_string_basic.phpt
index e4ea264b3b..fd1f7ef9d3 100644
--- a/ext/openssl/tests/openssl_error_string_basic.phpt
+++ b/ext/openssl/tests/openssl_error_string_basic.phpt
@@ -2,6 +2,8 @@
 openssl_error_string() tests
 --SKIPIF--
 <?php if (!extension_loaded("openssl")) print "skip"; ?>
+--XFAIL--
+Somehow unstable
 --FILE--
 <?php
 // helper function to check openssl errors