diff --git a/src/Symfony/Bridge/PhpUnit/Tests/CoverageListenerTest.php b/src/Symfony/Bridge/PhpUnit/Tests/CoverageListenerTest.php
index 957499dfb6..83f4085c80 100644
--- a/src/Symfony/Bridge/PhpUnit/Tests/CoverageListenerTest.php
+++ b/src/Symfony/Bridge/PhpUnit/Tests/CoverageListenerTest.php
@@ -31,11 +31,11 @@ class CoverageListenerTest extends TestCase
         $dir = __DIR__.'/../Tests/Fixtures/coverage';
         $phpunit = $_SERVER['argv'][0];
 
-        exec("$php $phpunit -c $dir/phpunit-without-listener.xml.dist $dir/tests/ --coverage-text", $output);
+        exec("$php $phpunit -c $dir/phpunit-without-listener.xml.dist $dir/tests/ --coverage-text 2> /dev/null", $output);
         $output = implode("\n", $output);
         $this->assertContains('FooCov', $output);
 
-        exec("$php $phpunit -c $dir/phpunit-with-listener.xml.dist $dir/tests/ --coverage-text", $output);
+        exec("$php $phpunit -c $dir/phpunit-with-listener.xml.dist $dir/tests/ --coverage-text 2> /dev/null", $output);
         $output = implode("\n", $output);
         $this->assertNotContains('FooCov', $output);
         $this->assertContains("SutNotFoundTest::test\nCould not find the tested class.", $output);
diff --git a/src/Symfony/Bridge/PhpUnit/bin/simple-phpunit b/src/Symfony/Bridge/PhpUnit/bin/simple-phpunit
index a824eae8f2..59c7a1fe35 100755
--- a/src/Symfony/Bridge/PhpUnit/bin/simple-phpunit
+++ b/src/Symfony/Bridge/PhpUnit/bin/simple-phpunit
@@ -47,7 +47,7 @@ if ('phpdbg' === PHP_SAPI) {
     $PHP .= ' -qrr';
 }
 
-$COMPOSER = file_exists($COMPOSER = $oldPwd.'/composer.phar') || ($COMPOSER = rtrim('\\' === DIRECTORY_SEPARATOR ? preg_replace('/[\r\n].*/', '', `where.exe composer.phar`) : `which composer.phar`))
+$COMPOSER = file_exists($COMPOSER = $oldPwd.'/composer.phar') || ($COMPOSER = rtrim('\\' === DIRECTORY_SEPARATOR ? preg_replace('/[\r\n].*/', '', `where.exe composer.phar`) : `which composer.phar 2> /dev/null`))
     ? $PHP.' '.escapeshellarg($COMPOSER)
     : 'composer';