diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index 6caa46b3562cc..1d03297a33b68 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -331,7 +331,9 @@ public function start(callable $callback = null/*, array $env = array()*/)
} else {
$envPairs = array();
foreach ($env as $k => $v) {
- $envPairs[] = $k.'='.$v;
+ if (false !== $v) {
+ $envPairs[] = $k.'='.$v;
+ }
}
}
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