diff --git a/addons/web/static/src/legacy/utils.js b/addons/web/static/src/legacy/utils.js
index 77fe054b742..47e50561453 100644
--- a/addons/web/static/src/legacy/utils.js
+++ b/addons/web/static/src/legacy/utils.js
@@ -190,6 +190,7 @@ export function mapLegacyEnvToWowlEnv(legacyEnv, wowlEnv) {
 
     legacyEnv.services.local_storage = mapStorage(browser.localStorage);
     legacyEnv.services.session_storage = mapStorage(browser.sessionStorage);
+    legacyEnv.services.dialog = wowlEnv.services.dialog;
     // map WebClientReady
     wowlEnv.bus.addEventListener("WEB_CLIENT_READY", () => {
         legacyEnv.bus.trigger("web_client_ready");