diff --git a/ext/zlib/tests/compress_zlib_wrapper.phpt b/ext/zlib/tests/compress_zlib_wrapper.phpt
index 0face03c6fe..4bed91a1238 100644
--- a/ext/zlib/tests/compress_zlib_wrapper.phpt
+++ b/ext/zlib/tests/compress_zlib_wrapper.phpt
@@ -4,11 +4,11 @@ compress.zlib:// wrapper
 <?php
 
 // Relative path
-$fp = fopen("compress.zlib://ext/xsl/tests/xslt.xsl.gz", "wb");
+$fp = fopen("compress.zlib://ext/xsl/tests/xslt.xsl.gz", "rb");
 fclose($fp);
 
 // Absolute path
-$fp = fopen("compress.zlib://". dirname(__FILE__). "/../../../ext/xsl/tests/xslt.xsl.gz", "wb");
+$fp = fopen("compress.zlib://". dirname(__FILE__). "/../../../ext/xsl/tests/xslt.xsl.gz", "rb");
 fclose($fp);
 
 echo "ok\n";