diff --git a/ext/zlib/tests/gzfile_variation15.phpt b/ext/zlib/tests/gzfile_variation15.phpt
index 153f56715bc..866348efa0e 100644
--- a/ext/zlib/tests/gzfile_variation15.phpt
+++ b/ext/zlib/tests/gzfile_variation15.phpt
@@ -8,7 +8,7 @@ if (!extension_loaded("zlib")) {
 ?>
 --FILE--
 <?php
-$thisTestDir = 'gzfile_variation15.dir';
+$testName = 'gzfile_variation15';
 require_once('reading_include_path.inc');
 
 //define the files to go into these directories, create one in dir2
diff --git a/ext/zlib/tests/gzopen_variation4.phpt b/ext/zlib/tests/gzopen_variation4.phpt
index baa9c715aeb..1648b75fb96 100644
--- a/ext/zlib/tests/gzopen_variation4.phpt
+++ b/ext/zlib/tests/gzopen_variation4.phpt
@@ -16,7 +16,7 @@ if (!extension_loaded("zlib")) {
 
 echo "*** Testing gzopen() : usage variation ***\n";
 
-$thisTestDir = 'gzopen_variation4.dir';
+$testName = 'gzopen_variation4';
 require_once('reading_include_path.inc');
 
 //define the files to go into these directories, create one in dir2
diff --git a/ext/zlib/tests/readgzfile_variation15.phpt b/ext/zlib/tests/readgzfile_variation15.phpt
index 40773f7bf01..48115c7fdb8 100644
--- a/ext/zlib/tests/readgzfile_variation15.phpt
+++ b/ext/zlib/tests/readgzfile_variation15.phpt
@@ -8,7 +8,7 @@ if (!extension_loaded("zlib")) {
 ?>
 --FILE--
 <?php
-$thisTestDir = 'readgzfile_variation15.dir';
+$testName = 'readgzfile_variation15';
 require_once('reading_include_path.inc');
 
 //define the files to go into these directories, create one in dir2
diff --git a/ext/zlib/tests/reading_include_path.inc b/ext/zlib/tests/reading_include_path.inc
index b4dbbc28046..99ac44503ad 100644
--- a/ext/zlib/tests/reading_include_path.inc
+++ b/ext/zlib/tests/reading_include_path.inc
@@ -1,10 +1,11 @@
 <?php
+$thisTestDir = $testName . '.dir';
 mkdir($thisTestDir);
 chdir($thisTestDir);
 
 //create the include directory structure
 $workingDir = "workdir";
-$filename = "afile.txt.gz";
+$filename = $testName . ".txt.gz";
 $scriptDir = dirname(__FILE__);
 $baseDir = getcwd();
 $secondFile = $baseDir."/dir2/".$filename;