diff --git a/src/crypto/store/memory-crypto-store.js b/src/crypto/store/memory-crypto-store.js
index 2897be81e..f3bab6516 100644
--- a/src/crypto/store/memory-crypto-store.js
+++ b/src/crypto/store/memory-crypto-store.js
@@ -69,7 +69,7 @@ export default class MemoryCryptoStore {
     getOrAddOutgoingRoomKeyRequest(request) {
         const requestBody = request.requestBody;
 
-        return Promise.try(() => {
+        return utils.promiseTry(() => {
             // first see if we already have an entry for this request.
             const existing = this._getOutgoingRoomKeyRequest(requestBody);
 
diff --git a/src/store/indexeddb-local-backend.js b/src/store/indexeddb-local-backend.js
index b1ddb144d..cbebb6c17 100644
--- a/src/store/indexeddb-local-backend.js
+++ b/src/store/indexeddb-local-backend.js
@@ -436,7 +436,7 @@ LocalIndexedDBStoreBackend.prototype = {
      */
     _persistSyncData: function(nextBatch, roomsData, groupsData) {
         logger.log("Persisting sync data up to ", nextBatch);
-        return Promise.try(() => {
+        return utils.promiseTry(() => {
             const txn = this.db.transaction(["sync"], "readwrite");
             const store = txn.objectStore("sync");
             store.put({
@@ -456,7 +456,7 @@ LocalIndexedDBStoreBackend.prototype = {
      * @return {Promise} Resolves if the events were persisted.
      */
     _persistAccountData: function(accountData) {
-        return Promise.try(() => {
+        return utils.promiseTry(() => {
             const txn = this.db.transaction(["accountData"], "readwrite");
             const store = txn.objectStore("accountData");
             for (let i = 0; i < accountData.length; i++) {
@@ -475,7 +475,7 @@ LocalIndexedDBStoreBackend.prototype = {
      * @return {Promise} Resolves if the users were persisted.
      */
     _persistUserPresenceEvents: function(tuples) {
-        return Promise.try(() => {
+        return utils.promiseTry(() => {
             const txn = this.db.transaction(["users"], "readwrite");
             const store = txn.objectStore("users");
             for (const tuple of tuples) {
@@ -495,7 +495,7 @@ LocalIndexedDBStoreBackend.prototype = {
      * @return {Promise<Object[]>} A list of presence events in their raw form.
      */
     getUserPresenceEvents: function() {
-        return Promise.try(() => {
+        return utils.promiseTry(() => {
             const txn = this.db.transaction(["users"], "readonly");
             const store = txn.objectStore("users");
             return selectQuery(store, undefined, (cursor) => {
@@ -512,7 +512,7 @@ LocalIndexedDBStoreBackend.prototype = {
         logger.log(
             `LocalIndexedDBStoreBackend: loading account data...`,
         );
-        return Promise.try(() => {
+        return utils.promiseTry(() => {
             const txn = this.db.transaction(["accountData"], "readonly");
             const store = txn.objectStore("accountData");
             return selectQuery(store, undefined, (cursor) => {
@@ -534,7 +534,7 @@ LocalIndexedDBStoreBackend.prototype = {
         logger.log(
             `LocalIndexedDBStoreBackend: loading sync data...`,
         );
-        return Promise.try(() => {
+        return utils.promiseTry(() => {
             const txn = this.db.transaction(["sync"], "readonly");
             const store = txn.objectStore("sync");
             return selectQuery(store, undefined, (cursor) => {
diff --git a/src/utils.js b/src/utils.js
index c24df57aa..2cf2dc509 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -737,3 +737,13 @@ module.exports.promiseMapSeries = async (promises, fn) => {
         await fn(await o);
     }
 };
+
+module.exports.promiseTry = (fn) => {
+    return new Promise((resolve, reject) => {
+        try {
+            fn().then(resolve, reject);
+        } catch (e) {
+            reject(e);
+        }
+    });
+};