diff --git a/src/Gateways/Test/TestGateway.php b/src/Gateways/Test/TestGateway.php
index 570eda4..0c5a406 100644
--- a/src/Gateways/Test/TestGateway.php
+++ b/src/Gateways/Test/TestGateway.php
@@ -92,7 +92,7 @@ public function purchaseUri(): string
 
     public function verify(): void
     {
-        if ($this->request['status'] ?? null === 'error') {
+        if (($this->request['status'] ?? null) === 'error') {
             throw TestException::error(-100);
         }