diff --git a/src/Bolt/BoltConnection.php b/src/Bolt/BoltConnection.php
index 6f503ef5..f238141b 100644
--- a/src/Bolt/BoltConnection.php
+++ b/src/Bolt/BoltConnection.php
@@ -135,7 +135,7 @@ public function getAuthentication(): AuthenticateInterface
      */
     public function isOpen(): bool
     {
-        return in_array($this->protocol()->serverState->get(), ['DISCONNECTED', 'DEFUNCT'], true);
+        return !in_array($this->protocol()->serverState->get(), ['DISCONNECTED', 'DEFUNCT'], true);
     }
 
     public function setTimeout(float $timeout): void