diff --git a/src/lib/is_array.js b/src/lib/is_array.js
index 9b7d64e41aa..cda78eeb627 100644
--- a/src/lib/is_array.js
+++ b/src/lib/is_array.js
@@ -11,6 +11,12 @@
 /**
  * Return true for arrays, whether they're untyped or not.
  */
+
+// IE9 fallback
+var ab = (typeof ArrayBuffer === 'undefined' || !ArrayBuffer.isView) ?
+    {isView: function() { return false; }} :
+    ArrayBuffer;
+
 module.exports = function isArray(a) {
-    return Array.isArray(a) || ArrayBuffer.isView(a);
+    return Array.isArray(a) || ab.isView(a);
 };
diff --git a/src/traces/heatmap/plot.js b/src/traces/heatmap/plot.js
index 1fc5eda33de..02fbf077ee7 100644
--- a/src/traces/heatmap/plot.js
+++ b/src/traces/heatmap/plot.js
@@ -337,7 +337,14 @@ function plotOne(gd, plotinfo, cd) {
 
     if(zsmooth) { // best or fast, works fastest with imageData
         var pxIndex = 0,
+            pixels;
+
+        try {
             pixels = new Uint8Array(imageWidth * imageHeight * 4);
+        }
+        catch(e) {
+            pixels = new Array(imageWidth * imageHeight * 4);
+        }
 
         if(zsmooth === 'best') {
             var xPixArray = new Array(x.length),
@@ -379,7 +386,17 @@ function plotOne(gd, plotinfo, cd) {
         }
 
         var imageData = context.createImageData(imageWidth, imageHeight);
-        imageData.data.set(pixels);
+        try {
+            imageData.data.set(pixels);
+        }
+        catch(e) {
+            var pxArray = imageData.data,
+                dlen = pxArray.length;
+            for(j = 0; j < dlen; j ++) {
+                pxArray[j] = pixels[j];
+            }
+        }
+
         context.putImageData(imageData, 0, 0);
     } else { // zsmooth = false -> filling potentially large bricks works fastest with fillRect
         for(j = 0; j < m; j++) {
diff --git a/test/jasmine/assets/ie9_mock.js b/test/jasmine/assets/ie9_mock.js
new file mode 100644
index 00000000000..0d032173c95
--- /dev/null
+++ b/test/jasmine/assets/ie9_mock.js
@@ -0,0 +1,8 @@
+delete window.Promise;
+
+delete window.ArrayBuffer;
+delete window.Uint8Array;
+delete window.Float32Array;
+delete window.Float64Array;
+delete window.Int16Array;
+delete window.Int32Array;
diff --git a/test/jasmine/bundle_tests/ie9_test.js b/test/jasmine/bundle_tests/ie9_test.js
new file mode 100644
index 00000000000..d874657245b
--- /dev/null
+++ b/test/jasmine/bundle_tests/ie9_test.js
@@ -0,0 +1,42 @@
+var Plotly = require('@lib/core');
+
+Plotly.register([
+    require('@lib/bar'),
+    require('@lib/box'),
+    require('@lib/heatmap'),
+    require('@lib/histogram'),
+    require('@lib/histogram2d'),
+    require('@lib/histogram2dcontour'),
+    require('@lib/pie'),
+    require('@lib/contour'),
+    require('@lib/scatterternary'),
+    require('@lib/ohlc'),
+    require('@lib/candlestick')
+]);
+
+var createGraphDiv = require('../assets/create_graph_div');
+var destroyGraphDiv = require('../assets/destroy_graph_div');
+
+describe('Bundle with IE9 supported trace types:', function() {
+
+    afterEach(destroyGraphDiv);
+
+    it(' check that ie9_mock.js did its job', function() {
+        expect(function() { return ArrayBuffer; })
+            .toThrow(new ReferenceError('ArrayBuffer is not defined'));
+        expect(function() { return Uint8Array; })
+            .toThrow(new ReferenceError('Uint8Array is not defined'));
+    });
+
+    it('heatmaps with smoothing should work', function(done) {
+        var gd = createGraphDiv();
+        var data = [{
+            type: 'heatmap',
+            z: [[1, 2, 3], [2, 1, 2]],
+            zsmooth: 'best'
+        }];
+
+        Plotly.plot(gd, data).then(done);
+    });
+
+});
diff --git a/test/jasmine/karma.conf.js b/test/jasmine/karma.conf.js
index 28f046bc961..bd84e867925 100644
--- a/test/jasmine/karma.conf.js
+++ b/test/jasmine/karma.conf.js
@@ -20,6 +20,7 @@ var arg = process.argv[4];
 var testFileGlob = arg ? arg : 'tests/*_test.js';
 var isSingleSuiteRun = (arg && arg.indexOf('bundle_tests/') === -1);
 var isRequireJSTest = (arg && arg.indexOf('bundle_tests/requirejs') !== -1);
+var isIE9Test = (arg && arg.indexOf('bundle_tests/ie9') !== -1);
 
 var pathToMain = '../../lib/index.js';
 var pathToJQuery = 'assets/jquery-1.8.3.min.js';
@@ -127,6 +128,18 @@ else if(isRequireJSTest) {
         testFileGlob
     ];
 }
+else if(isIE9Test) {
+    // load ie9_mock.js before plotly.js+test bundle
+    // to catch reference errors that could occur
+    // when plotly.js is first loaded.
+
+    func.defaultConfig.files = [
+        './assets/ie9_mock.js',
+        testFileGlob
+    ];
+
+    func.defaultConfig.preprocessors[testFileGlob] = ['browserify'];
+}
 else {
     func.defaultConfig.files = [
         pathToJQuery,