diff --git a/src/AddThreepid.js b/src/AddThreepid.js
index f47b26bea0..a523e43643 100644
--- a/src/AddThreepid.js
+++ b/src/AddThreepid.js
@@ -17,6 +17,7 @@ limitations under the License.
 
 import MatrixClientPeg from './MatrixClientPeg';
 import { _t } from './languageHandler';
+import IdentityAuthClient from './IdentityAuthClient';
 
 /**
  * Allows a user to add a third party identifier to their homeserver and,
@@ -103,14 +104,19 @@ export default class AddThreepid {
     /**
      * Takes a phone number verification code as entered by the user and validates
      * it with the ID server, then if successful, adds the phone number.
-     * @param {string} token phone number verification code as entered by the user
+     * @param {string} msisdnToken phone number verification code as entered by the user
      * @return {Promise} Resolves if the phone number was added. Rejects with an object
      * with a "message" property which contains a human-readable message detailing why
      * the request failed.
      */
-    async haveMsisdnToken(token) {
+    async haveMsisdnToken(msisdnToken) {
+        const authClient = new IdentityAuthClient();
+        const isAccessToken = await authClient.getAccessToken();
         const result = await MatrixClientPeg.get().submitMsisdnToken(
-            this.sessionId, this.clientSecret, token,
+            this.sessionId,
+            this.clientSecret,
+            msisdnToken,
+            isAccessToken,
         );
         if (result.errcode) {
             throw result;