diff --git a/src/Assetic/Util/ProcessBuilder.php b/src/Assetic/Util/ProcessBuilder.php
index 109a75337..6a46883a0 100644
--- a/src/Assetic/Util/ProcessBuilder.php
+++ b/src/Assetic/Util/ProcessBuilder.php
@@ -110,7 +110,7 @@ public function getProcess()
         } else {
             $script = implode(' ', array_map('escapeshellarg', $this->arguments));
         }
-        $env = $this->inheritEnv && $_ENV ? ($this->env ?: array()) + $_ENV : $this->env;
+        $env = $this->inheritEnv && $_SERVER ? ($this->env ?: array()) + $_SERVER : $this->env;
 
         return new Process($script, $this->cwd, $env, $this->stdin, $this->timeout, $options);
     }