diff --git a/bower.json b/bower.json
index 30eb3e85..a1a46e71 100644
--- a/bower.json
+++ b/bower.json
@@ -25,5 +25,5 @@
     "assert": "~0.1.0",
     "modernizr": "~2.8.1"
   },
-  "version": "1.5.6"
+  "version": "1.5.7"
 }
diff --git a/component.json b/component.json
index d8b499a9..08bca406 100644
--- a/component.json
+++ b/component.json
@@ -1,6 +1,6 @@
 {
   "name": "localforage",
-  "version": "1.5.6",
+  "version": "1.5.7",
   "dependencies": {
     "then/promise": "5.0.0"
   },
diff --git a/dist/localforage.js b/dist/localforage.js
index 628069aa..f80ba698 100644
--- a/dist/localforage.js
+++ b/dist/localforage.js
@@ -1,6 +1,6 @@
 /*!
     localForage -- Offline Storage, Improved
-    Version 1.5.6
+    Version 1.5.7
     https://localforage.github.io/localForage
     (c) 2013-2017 Mozilla, Apache License 2.0
 */
@@ -90,7 +90,7 @@ var REJECTED = ['REJECTED'];
 var FULFILLED = ['FULFILLED'];
 var PENDING = ['PENDING'];
 
-module.exports = exports = Promise;
+module.exports = Promise;
 
 function Promise(resolver) {
   if (typeof resolver !== 'function') {
@@ -196,7 +196,7 @@ handlers.reject = function (self, error) {
 function getThen(obj) {
   // Make sure we only access the accessor once as required by the spec
   var then = obj && obj.then;
-  if (obj && typeof obj === 'object' && typeof then === 'function') {
+  if (obj && (typeof obj === 'object' || typeof obj === 'function') && typeof then === 'function') {
     return function appyThen() {
       then.apply(obj, arguments);
     };
@@ -244,7 +244,7 @@ function tryCatch(func, value) {
   return out;
 }
 
-exports.resolve = resolve;
+Promise.resolve = resolve;
 function resolve(value) {
   if (value instanceof this) {
     return value;
@@ -252,13 +252,13 @@ function resolve(value) {
   return handlers.resolve(new this(INTERNAL), value);
 }
 
-exports.reject = reject;
+Promise.reject = reject;
 function reject(reason) {
   var promise = new this(INTERNAL);
   return handlers.reject(promise, reason);
 }
 
-exports.all = all;
+Promise.all = all;
 function all(iterable) {
   var self = this;
   if (Object.prototype.toString.call(iterable) !== '[object Array]') {
@@ -297,7 +297,7 @@ function all(iterable) {
   }
 }
 
-exports.race = race;
+Promise.race = race;
 function race(iterable) {
   var self = this;
   if (Object.prototype.toString.call(iterable) !== '[object Array]') {
@@ -1808,7 +1808,9 @@ var webSQLStorage = {
 
 function isLocalStorageValid() {
     try {
-        return typeof localStorage !== 'undefined' && 'setItem' in localStorage && typeof localStorage.setItem === 'function';
+        return typeof localStorage !== 'undefined' && 'setItem' in localStorage &&
+        // in IE8 typeof localStorage.setItem === 'object'
+        !!localStorage.setItem;
     } catch (e) {
         return false;
     }
diff --git a/dist/localforage.min.js b/dist/localforage.min.js
index 301f4bd3..965bc373 100644
--- a/dist/localforage.min.js
+++ b/dist/localforage.min.js
@@ -1,7 +1,7 @@
 /*!
     localForage -- Offline Storage, Improved
-    Version 1.5.6
+    Version 1.5.7
     https://localforage.github.io/localForage
     (c) 2013-2017 Mozilla, Apache License 2.0
 */
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diff --git a/dist/localforage.nopromises.js b/dist/localforage.nopromises.js
index bb65d1ba..c9847d15 100644
--- a/dist/localforage.nopromises.js
+++ b/dist/localforage.nopromises.js
@@ -1,6 +1,6 @@
 /*!
     localForage -- Offline Storage, Improved
-    Version 1.5.6
+    Version 1.5.7
     https://localforage.github.io/localForage
     (c) 2013-2017 Mozilla, Apache License 2.0
 */
@@ -1472,7 +1472,9 @@ var webSQLStorage = {
 
 function isLocalStorageValid() {
     try {
-        return typeof localStorage !== 'undefined' && 'setItem' in localStorage && typeof localStorage.setItem === 'function';
+        return typeof localStorage !== 'undefined' && 'setItem' in localStorage &&
+        // in IE8 typeof localStorage.setItem === 'object'
+        !!localStorage.setItem;
     } catch (e) {
         return false;
     }
diff --git a/dist/localforage.nopromises.min.js b/dist/localforage.nopromises.min.js
index 2e0fd0d2..3aad74f6 100644
--- a/dist/localforage.nopromises.min.js
+++ b/dist/localforage.nopromises.min.js
@@ -1,7 +1,7 @@
 /*!
     localForage -- Offline Storage, Improved
-    Version 1.5.6
+    Version 1.5.7
     https://localforage.github.io/localForage
     (c) 2013-2017 Mozilla, Apache License 2.0
 */
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diff --git a/package.json b/package.json
index 724935fc..f1a5d7e7 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "storage",
     "websql"
   ],
-  "version": "1.5.6",
+  "version": "1.5.7",
   "homepage": "https://github.com/localForage/localForage",
   "repository": {
     "type": "git",