diff --git a/lib/index.js b/lib/index.js
index 74a8084..8de1722 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -59,6 +59,9 @@ const webAuth = (opener, opts, body) => {
     ...opts,
     method: 'POST',
     body,
+    headers: {
+      'npm-use-webauthn': opts.authType === 'webauthn',
+    },
   }).then(res => {
     return Promise.all([res, res.json()])
   }).then(([res, content]) => {