diff --git a/go.mod b/go.mod
index 32a891e94..2ee6c124c 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/prymitive/karma
 
-go 1.12
+go 1.14
 
 require (
 	github.com/DeanThompson/ginpprof v0.0.0-20190408063150-3be636683586
diff --git a/internal/alertmanager/tls.go b/internal/alertmanager/tls.go
index 45f3d9151..bb3641783 100644
--- a/internal/alertmanager/tls.go
+++ b/internal/alertmanager/tls.go
@@ -29,7 +29,6 @@ func configureTLSClientCert(tlsConfig *tls.Config, certPath, keyPath string) err
 		return err
 	}
 	tlsConfig.Certificates = []tls.Certificate{cert}
-	tlsConfig.BuildNameToCertificate()
 	return nil
 }