diff --git a/src/legacy-polyfill.js b/src/legacy-polyfill.js
index 0ce493e0..c3c8263b 100644
--- a/src/legacy-polyfill.js
+++ b/src/legacy-polyfill.js
@@ -15,6 +15,14 @@ limitations under the License.
 */
 
 // polyfills needed for IE11
+import Promise from "../lib/es6-promise/index.js";
+import {checkNeedsSyncPromise} from "./matrix/storage/idb/utils.js";
+
+if (typeof window.Promise === "undefined") {
+    window.Promise = Promise;
+    // TODO: should be awaited before opening any session in the picker
+    checkNeedsSyncPromise();
+}
 import "core-js/stable";
 import "regenerator-runtime/runtime";
 import "mdn-polyfills/Element.prototype.closest";
@@ -24,14 +32,6 @@ import "mdn-polyfills/Element.prototype.closest";
 // it will also include the file supporting *all* the encodings,
 // weighing a good extra 500kb :-(
 import "text-encoding";
-import {checkNeedsSyncPromise} from "./matrix/storage/idb/utils.js";
-import Promise from "../lib/es6-promise/index.js";
-
-if (typeof window.Promise === "undefined") {
-    window.Promise = Promise;
-    // TODO: should be awaited before opening any session in the picker
-    checkNeedsSyncPromise();
-}
 
 // TODO: contribute this to mdn-polyfills
 if (!Element.prototype.remove) {