diff --git a/auth/middleware.go b/auth/middleware.go
index 508c4beea2542b6b606b98e95cbaffb1df5b4de7..a5a3527e50698b312398897b8dcaf4ac1ade338e 100644
--- a/auth/middleware.go
+++ b/auth/middleware.go
@@ -705,6 +705,7 @@ 			}
 
 			auth := r.Header.Get("Authorization")
 			if auth == "" {
+				w.Header().Set("WWW-Authenticate", "Bearer")
 				authError(w, `Authorization header is required. Expected 'Authorization: Bearer [token]'`, http.StatusUnauthorized)
 				return
 			}