diff --git a/src/Symfony/Component/Console/Output/StreamOutput.php b/src/Symfony/Component/Console/Output/StreamOutput.php
index de5f62404312e..f90a0e7e41758 100644
--- a/src/Symfony/Component/Console/Output/StreamOutput.php
+++ b/src/Symfony/Component/Console/Output/StreamOutput.php
@@ -74,8 +74,7 @@ protected function doWrite($message, $newline)
             $message .= PHP_EOL;
         }
 
-        if (!is_resource($this->stream) || !is_string($message)) {
-            // should never happen
+        if (!is_string($message)) {
             throw new RuntimeException('Unable to write output.');
         }
         @fwrite($this->stream, $message);