diff --git a/src/Client.php b/src/Client.php
index 38154cc..a6f112a 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -229,7 +229,7 @@ public function recv()
             $this->connect($this->getConnectData('clean_session') ?? true, $this->getConnectData('will') ?? []);
         } elseif ($response === false && $this->client->errCode !== SOCKET_ETIMEDOUT) {
             $this->handleException();
-        } elseif (is_string($response) && strlen($response) != 0) {
+        } elseif (is_string($response) && strlen($response) !== 0) {
             $this->handleVerbose($response);
 
             if ($this->getConfig()->isMQTT5()) {