diff --git a/sea.js b/sea.js
index 63dc6b36..0a3f77dc 100644
--- a/sea.js
+++ b/sea.js
@@ -500,12 +500,12 @@
           const ecdhSubtle = ossl || subtle
           const keysToEcdhJwk = (pub, d) => { // d === priv
             const [ x, y ] = Buffer.from(pub, 'base64').toString('utf8').split(':')
-            const key_ops = [ `${d ? 'de' : 'en'}crypt`, 'deriveKey' ]
+            const key_ops = [ `${d ? 'de' : 'en'}crypt` /*, 'deriveKey' */ ]
             const jwk = d ? { d, key_ops } : { key_ops }
             return Object.assign(jwk, {
               kty: 'EC',
               crv: 'P-256',
-              ext: false,
+              ext: true,
               x,
               y
             })