diff --git a/src/Symfony/Component/Console/Output/StreamOutput.php b/src/Symfony/Component/Console/Output/StreamOutput.php
index e876dabfee65d..4fe3f221d95e4 100644
--- a/src/Symfony/Component/Console/Output/StreamOutput.php
+++ b/src/Symfony/Component/Console/Output/StreamOutput.php
@@ -74,7 +74,7 @@ protected function doWrite($message, $newline)
             $message .= PHP_EOL;
         }
 
-        if (!\is_resource($this->stream) || !\is_string($message)) {
+        if (!\is_string($message)) {
             // should never happen
             throw new RuntimeException('Unable to write output.');
         }