--- a/services/sync/modules/browserid_identity.js
+++ b/services/sync/modules/browserid_identity.js
@@ -204,16 +204,19 @@ this.BrowserIDManager.prototype = {
       this._log.info("Waiting for user to be verified.");
       this._fxaService.whenVerified(accountData).then(accountData => {
         this._updateSignedInUser(accountData);
         this._log.info("Starting fetch for key bundle.");
         if (this.needsCustomization) {
           let data = this.offerSyncOptions();
           if (data.accepted) {
             Services.prefs.clearUserPref(PREF_SYNC_SHOW_CUSTOMIZATION);
+
+            // Mark any non-selected engines as declined.
+            Weave.Service.engineManager.declineDisabled();
           } else {
             // Log out if the user canceled the dialog.
             return this._fxaService.signOut();
           }
         }
       }).then(() => {
         return this._fetchSyncKeyBundle();
       }).then(() => {