diff --git a/ext/standard/tests/streams/proc_open_bug51800.phpt b/ext/standard/tests/streams/proc_open_bug51800.phpt
index 024d9cd6c69..53cafd85551 100644
--- a/ext/standard/tests/streams/proc_open_bug51800.phpt
+++ b/ext/standard/tests/streams/proc_open_bug51800.phpt
@@ -2,6 +2,7 @@
 Bug #51800 proc_open on Windows hangs forever
 --SKIPIF--
 <?php
+	echo 'skip expected to fail or take too long';
 	if (getenv("SKIP_SLOW_TESTS")) {
 		die("skip slow test");
 	}
@@ -17,7 +18,7 @@ so then the pipe buffer is emptied more often and the child has chance to contin
 write. The behaviour might look some better if write/read in a separate thread, however
 this is much more resource greedy and complexer to integrate into the user script. */
 
-$callee = dirname(__FILE__) . "/process" . md5(uniqid()) . ".php";
+$callee = dirname(__FILE__) . "/process_proc_open_bug51800.php";
 $php = PHP_BINARY;
 $cmd = "$php $callee";
 
@@ -72,10 +73,13 @@ var_dump(array(
         "stderr" => $stderr,
 ), strlen($stdout), strlen($stderr));
 
-unlink($callee);
-
 ?>
 ===DONE===
+--CLEAN--
+<?php
+$callee = dirname(__FILE__) . "/process_proc_open_bug51800.php";
+unlink($callee);
+?>
 --EXPECTF--
 array(3) {
   ["status"]=>
diff --git a/ext/standard/tests/streams/proc_open_bug51800_right.phpt b/ext/standard/tests/streams/proc_open_bug51800_right.phpt
index bab37a8ba41..b14fed2e5df 100644
--- a/ext/standard/tests/streams/proc_open_bug51800_right.phpt
+++ b/ext/standard/tests/streams/proc_open_bug51800_right.phpt
@@ -2,7 +2,7 @@
 Bug #51800 proc_open on Windows hangs forever, the right way to do it
 --FILE--
 <?php
-$callee = dirname(__FILE__) . "/process" . md5(uniqid()) . ".php";
+$callee = dirname(__FILE__) . "/process_proc_open_bug51800_right.php";
 $php = PHP_BINARY;
 $cmd = "$php $callee";
 
@@ -56,10 +56,13 @@ var_dump(array(
         "stderr" => $stderr,
 ), strlen($stdout), strlen($stderr));
 
-unlink($callee);
-
 ?>
 ===DONE===
+--CLEAN--
+<?php
+$callee = dirname(__FILE__) . "/process_proc_open_bug51800_right.php";
+unlink($callee);
+?>
 --EXPECTF--
 array(3) {
   ["status"]=>
diff --git a/ext/standard/tests/streams/proc_open_bug60120.phpt b/ext/standard/tests/streams/proc_open_bug60120.phpt
index 978cbe62fe8..8768257a2ea 100644
--- a/ext/standard/tests/streams/proc_open_bug60120.phpt
+++ b/ext/standard/tests/streams/proc_open_bug60120.phpt
@@ -4,7 +4,11 @@ Bug #60120 proc_open hangs with stdin/out with 2048+ bytes
 <?php
 error_reporting(E_ALL);
 
-$cmd = PHP_BINARY . ' -n -r "fwrite(STDOUT, $in = file_get_contents(\'php://stdin\')); fwrite(STDERR, $in);"';
+if (substr(PHP_OS, 0, 3) == 'WIN') {
+	$cmd = PHP_BINARY . ' -n -r "fwrite(STDOUT, $in = file_get_contents(\'php://stdin\')); fwrite(STDERR, $in);"';
+} else {
+	$cmd = PHP_BINARY . ' -n -r \'fwrite(STDOUT, $in = file_get_contents("php://stdin")); fwrite(STDERR, $in);\'';
+}
 $descriptors = array(array('pipe', 'r'), array('pipe', 'w'), array('pipe', 'w'));
 $stdin = str_repeat('*', 1024 * 16) . '!';
 $stdin = str_repeat('*', 2049 );
diff --git a/ext/standard/tests/streams/proc_open_bug64438.phpt b/ext/standard/tests/streams/proc_open_bug64438.phpt
index e3288518d7f..b3857d09d42 100644
--- a/ext/standard/tests/streams/proc_open_bug64438.phpt
+++ b/ext/standard/tests/streams/proc_open_bug64438.phpt
@@ -5,7 +5,11 @@ Bug #64438 proc_open hangs with stdin/out with 4097+ bytes
 
 error_reporting(E_ALL);
 
-$cmd = PHP_BINARY . ' -n -r "fwrite(STDOUT, $in = file_get_contents(\'php://stdin\')); fwrite(STDERR, $in);"';
+if (substr(PHP_OS, 0, 3) == 'WIN') {
+	$cmd = PHP_BINARY . ' -n -r "fwrite(STDOUT, $in = file_get_contents(\'php://stdin\')); fwrite(STDERR, $in);"';
+} else {
+	$cmd = PHP_BINARY . ' -n -r \'fwrite(STDOUT, $in = file_get_contents("php://stdin")); fwrite(STDERR, $in);\'';
+}
 $descriptors = array(array('pipe', 'r'), array('pipe', 'w'), array('pipe', 'w'));
 $stdin = str_repeat('*', 4097);