diff --git a/tests/Smtp/AsyncSmtpMailerIntegrationTest.php b/tests/Smtp/AsyncSmtpMailerIntegrationTest.php
index b0c8b15..2e76f0b 100644
--- a/tests/Smtp/AsyncSmtpMailerIntegrationTest.php
+++ b/tests/Smtp/AsyncSmtpMailerIntegrationTest.php
@@ -157,7 +157,7 @@ function (Timer $timer) use ($time, $subject, $startTime, $waitingInterval): voi
 					if ($imap === false) {
 						$error = imap_last_error();
 
-						throw new Exception($error !== false ? $error : 'IMAP error occured.');
+						throw new Exception($error !== false ? $error : 'IMAP error occurred.');
 					}
 					$searchQuery = sprintf('SUBJECT "%s" SINCE "%s" FROM "%s"', $time, date('Y-m-d', $time), $settings->getEmailFrom());
 					$emails = imap_search($imap, $searchQuery, SE_UID);