diff --git a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
index fca9f1727ba28..65c947d85fcf7 100644
--- a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
+++ b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
@@ -1316,7 +1316,7 @@ public function resolveEnvPlaceholders($value, $format = null, array &$usedEnvs
                     } else {
                         $resolved = sprintf($format, $env);
                     }
-                    $value = is_string($value) ? str_ireplace($placeholder, $resolved, $value) : (string) $value;
+                    $value = str_ireplace($placeholder, $resolved, $value);
                     $usedEnvs[$env] = $env;
                     $this->envCounters[$env] = isset($this->envCounters[$env]) ? 1 + $this->envCounters[$env] : 1;
                 }