diff --git a/src/Client.php b/src/Client.php
index 9480549..902e3f9 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -56,7 +56,7 @@ public function __construct($config1 = [], $config2 = null, array $config = [])
             return;
         }
 
-        @trigger_error(E_USER_DEPRECATED, 'Passing a Psr\Http\Message\ResponseFactoryInterface and a Psr\Http\Message\StreamFactoryInterface to SocketClient is deprecated, and will be removed in 3.0, you should only pass config options.');
+        @trigger_error('Passing a Psr\Http\Message\ResponseFactoryInterface and a Psr\Http\Message\StreamFactoryInterface to SocketClient is deprecated, and will be removed in 3.0, you should only pass config options.', E_USER_DEPRECATED);
 
         $this->config = $this->configure($config);
     }