diff --git a/src/Executor/ParallelExecutor.php b/src/Executor/ParallelExecutor.php
index 26795c69..90566985 100644
--- a/src/Executor/ParallelExecutor.php
+++ b/src/Executor/ParallelExecutor.php
@@ -171,7 +171,11 @@ class ParallelExecutor implements ExecutorInterface
         }
 
         $command = "$dep $file worker $arguments $options --hostname $hostname --task $taskName --config-file $configFile";
-        $process = Process::fromShellCommandline($command);
+        if (method_exists('Symfony\Component\Process\Process', 'fromShellCommandline')) {
+            $process = Process::fromShellCommandline($command);
+        } else {
+            $process = new Process($command);
+        }
 
         if (!defined('DEPLOYER_PARALLEL_PTY')) {
             $process->setPty(true);
diff --git a/src/Utility/ProcessRunner.php b/src/Utility/ProcessRunner.php
index 06493e44..f2f14b55 100644
--- a/src/Utility/ProcessRunner.php
+++ b/src/Utility/ProcessRunner.php
@@ -44,11 +44,12 @@ class ProcessRunner
 
         $this->pop->command($hostname, $command);
 
-        if (method_exists('Process', 'fromShellCommandline')) {
+        if (method_exists('Symfony\Component\Process\Process', 'fromShellCommandline')) {
             $process = Process::fromShellCommandline($command);
         } else {
             $process = new Process($command);
         }
+
         $process
             ->setTimeout($config['timeout'])
             ->setTty($config['tty'])
diff --git a/test/recipe/tester.php b/test/recipe/tester.php
index 9fedd058..d664ea6e 100644
--- a/test/recipe/tester.php
+++ b/test/recipe/tester.php
@@ -21,7 +21,11 @@ function exec($command)
         $command = 'cd ' . DepCase::$currentPath . ' && ' . $command;
     }
 
-    $process = Process::fromShellCommandline($command);
+    if (method_exists('Symfony\Component\Process\Process', 'fromShellCommandline')) {
+        $process = Process::fromShellCommandline($command);
+    } else {
+        $process = new Process($command);
+    }
     $process
         ->mustRun();