diff --git a/pkg/tsdb/prometheus/prometheus.go b/pkg/tsdb/prometheus/prometheus.go
index c73e166138d..efe8e2fc528 100644
--- a/pkg/tsdb/prometheus/prometheus.go
+++ b/pkg/tsdb/prometheus/prometheus.go
@@ -66,8 +66,8 @@ func (e *PrometheusExecutor) getClient() (prometheus.QueryAPI, error) {
 	if e.BasicAuth {
 		cfg.Transport = basicAuthTransport{
 			Transport: e.Transport,
-			username: e.BasicAuthUser,
-			password: e.BasicAuthPassword,
+			username:  e.BasicAuthUser,
+			password:  e.BasicAuthPassword,
 		}
 	}