diff --git a/pkg/services/ngalert/remote/alertmanager_test.go b/pkg/services/ngalert/remote/alertmanager_test.go
index e3d923f0ea3..b04c7194ee0 100644
--- a/pkg/services/ngalert/remote/alertmanager_test.go
+++ b/pkg/services/ngalert/remote/alertmanager_test.go
@@ -767,7 +767,6 @@ global:
     http_config:
         follow_redirects: true
         enable_http2: true
-        http_headers: null
     smtp_hello: localhost
     smtp_require_tls: true
     pagerduty_url: https://events.pagerduty.com/v2/enqueue