diff --git a/tests/streams_001.phpt b/tests/streams_001.phpt
index fe7576d..0fc674d 100644
--- a/tests/streams_001.phpt
+++ b/tests/streams_001.phpt
@@ -4,7 +4,7 @@ compress.brotli streams basic
 <?php
 include(dirname(__FILE__) . '/data.inc');
 
-$file = dirname(__FILE__) . '/data.out';
+$file = dirname(__FILE__) . '/data_' . basename(__FILE__, ".php") . '.out';
 
 echo "Compression with default level\n";
 
diff --git a/tests/streams_002.phpt b/tests/streams_002.phpt
index 6ee3ef7..6d318f5 100644
--- a/tests/streams_002.phpt
+++ b/tests/streams_002.phpt
@@ -4,7 +4,7 @@ compress.brotli streams and compatibility
 <?php
 include(dirname(__FILE__) . '/data.inc');
 
-$file = dirname(__FILE__) . '/data.out';
+$file = dirname(__FILE__) . '/data_' . basename(__FILE__, ".php") . '.out';
 
 echo "Stream compression + brotli_uncompress\n";
 
diff --git a/tests/streams_004.phpt b/tests/streams_004.phpt
index b8d99d1..aff4c0d 100644
--- a/tests/streams_004.phpt
+++ b/tests/streams_004.phpt
@@ -4,7 +4,7 @@ compress.brotli streams with file functions
 <?php
 include(dirname(__FILE__) . '/data.inc');
 
-$file = dirname(__FILE__) . '/data.out';
+$file = dirname(__FILE__) . '/data_' . basename(__FILE__, ".php") . '.out';
 
 echo "Compression\n";