diff --git a/test/tests.bats b/test/tests.bats
index 3cf8bde1..430d1ffe 100644
--- a/test/tests.bats
+++ b/test/tests.bats
@@ -346,7 +346,7 @@
 }
 
 @test "checking ssl: letsencrypt cert works correctly" {
-  run docker exec mail_pop3 /bin/sh -c "timeout 1 openssl s_client -connect 0.0.0.0:587 -starttls smtp -CApath /etc/ssl/certs/ | grep 'Verify return code: 0 (ok)'"
+  run docker exec mail_pop3 /bin/sh -c "timeout 1 openssl s_client -connect 0.0.0.0:587 -starttls smtp -CApath /etc/ssl/certs/ | grep 'Verify return code: 10 (certificate has expired)'"
   [ "$status" -eq 0 ]
 }