diff --git a/src/Connection/StreamConnection.php b/src/Connection/StreamConnection.php
index 8dddb0f5..a33bdb42 100644
--- a/src/Connection/StreamConnection.php
+++ b/src/Connection/StreamConnection.php
@@ -117,7 +117,7 @@ class StreamConnection extends AbstractConnection
      */
     protected function unixStreamInitializer(ParametersInterface $parameters)
     {
-        if ($scheme === 'unix' && !isset($parameters->path)) {
+        if (!isset($parameters->path)) {
             throw new InvalidArgumentException('Missing UNIX domain socket path.');
         }