diff --git a/src/Composer/Command/InitCommand.php b/src/Composer/Command/InitCommand.php
index 02efbf686..abcea73b2 100644
--- a/src/Composer/Command/InitCommand.php
+++ b/src/Composer/Command/InitCommand.php
@@ -557,7 +557,12 @@ EOT
         $finder = new ExecutableFinder();
         $gitBin = $finder->find('git');
 
-        $cmd = new Process(sprintf('%s config -l', ProcessExecutor::escape($gitBin)));
+        // TODO in v3 always call with an array
+        if (method_exists('Symfony\Component\Process\Process', 'fromShellCommandline')) {
+            $cmd = new Process(array($gitBin, 'config', '-l'));
+        } else {
+            $cmd = new Process(sprintf('%s config -l', ProcessExecutor::escape($gitBin)));
+        }
         $cmd->run();
 
         if ($cmd->isSuccessful()) {
diff --git a/src/Composer/Util/Perforce.php b/src/Composer/Util/Perforce.php
index b064feec4..31ddeffec 100644
--- a/src/Composer/Util/Perforce.php
+++ b/src/Composer/Util/Perforce.php
@@ -370,7 +370,13 @@ class Perforce
     public function windowsLogin($password)
     {
         $command = $this->generateP4Command(' login -a');
-        $process = new Process($command, null, null, $password);
+
+        // TODO in v3 generate command as an array
+        if (method_exists('Symfony\Component\Process\Process', 'fromShellCommandline')) {
+            $process = Process::fromShellCommandline($command, null, null, $password);
+        } else {
+            $process = new Process($command, null, null, $password);
+        }
 
         return $process->run();
     }
diff --git a/src/Composer/Util/ProcessExecutor.php b/src/Composer/Util/ProcessExecutor.php
index 2a0742778..f5e1ef610 100644
--- a/src/Composer/Util/ProcessExecutor.php
+++ b/src/Composer/Util/ProcessExecutor.php
@@ -62,7 +62,13 @@ class ProcessExecutor
 
         $this->captureOutput = func_num_args() > 1;
         $this->errorOutput = null;
-        $process = new Process($command, $cwd, null, null, static::getTimeout());
+
+        // TODO in v3, commands should be passed in as arrays of cmd + args
+        if (method_exists('Symfony\Component\Process\Process', 'fromShellCommandline')) {
+            $process = Process::fromShellCommandline($command, $cwd, null, null, static::getTimeout());
+        } else {
+            $process = new Process($command, $cwd, null, null, static::getTimeout());
+        }
 
         $callback = is_callable($output) ? $output : array($this, 'outputHandler');
         $process->run($callback);