diff --git a/derp.go b/derp.go
index 6a153d2a..c3d100b3 100644
--- a/derp.go
+++ b/derp.go
@@ -34,7 +34,7 @@ func loadDERPMapFromURL(addr url.URL) (*tailcfg.DERPMap, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), HTTPReadTimeout)
 	defer cancel()
 
-	req, err := http.NewRequestWithContext(ctx, "GET", addr.String(), nil)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, addr.String(), nil)
 	if err != nil {
 		return nil, err
 	}
diff --git a/derp_server.go b/derp_server.go
index dbdbc7a5..b9650154 100644
--- a/derp_server.go
+++ b/derp_server.go
@@ -174,7 +174,7 @@ func (h *Headscale) DERPProbeHandler(
 	req *http.Request,
 ) {
 	switch req.Method {
-	case "HEAD", "GET":
+	case http.MethodHead, http.MethodGet:
 		writer.Header().Set("Access-Control-Allow-Origin", "*")
 		writer.WriteHeader(http.StatusOK)
 	default: