diff --git a/ext/phar/tests/gh18953.phpt b/ext/phar/tests/gh18953.phpt
index 52bbace2406..ff48e457cc9 100644
--- a/ext/phar/tests/gh18953.phpt
+++ b/ext/phar/tests/gh18953.phpt
@@ -2,6 +2,7 @@
 GH-18953 (Phar: Stream double free)
 --EXTENSIONS--
 phar
+zlib
 --INI--
 phar.readonly=0
 --FILE--