diff --git a/dist/image-sequencer.js b/dist/image-sequencer.js
index 82c17e75..655fc72b 100644
--- a/dist/image-sequencer.js
+++ b/dist/image-sequencer.js
@@ -184165,7 +184165,7 @@ ImageSequencer = function ImageSequencer(options) {
   function addStep(name, o) {
     console.log('adding step "' + name + '"');
 
-    if (typeof(window) != undefined)
+    if (typeof(window) != "undefined")
       for(var variable in window)
         if(window[variable] == this)
           options.instanceName = variable;
@@ -184253,7 +184253,7 @@ ImageSequencer = function ImageSequencer(options) {
   // i.e. from parameter
   // this could send the image to ImageSelect, or something?
   function loadImage(src, callback) {
-    if (typeof(window) != undefined)
+    if (typeof(window) != "undefined")
       for(var variable in window)
         if(window[variable] == this)
           options.instanceName = variable;
@@ -184613,7 +184613,7 @@ module.exports = function PixelManipulation(image, options) {
     }
 
     // iterate through pixels;
-    // this could possibly be more efficient; see 
+    // this could possibly be more efficient; see
     // https://github.com/p-v-o-s/infragram-js/blob/master/public/infragram.js#L173-L181
     for(var x = 1; x < pixels.shape[0]; x++) {
       for(var y = 1; y < pixels.shape[1]; y++) {
diff --git a/src/ImageSequencer.js b/src/ImageSequencer.js
index 0bba55a5..52a24e80 100644
--- a/src/ImageSequencer.js
+++ b/src/ImageSequencer.js
@@ -19,7 +19,7 @@ ImageSequencer = function ImageSequencer(options) {
   function addStep(name, o) {
     console.log('adding step "' + name + '"');
 
-    if (typeof(window) != undefined)
+    if (typeof(window) != "undefined")
       for(var variable in window)
         if(window[variable] == this)
           options.instanceName = variable;
@@ -107,7 +107,7 @@ ImageSequencer = function ImageSequencer(options) {
   // i.e. from parameter
   // this could send the image to ImageSelect, or something?
   function loadImage(src, callback) {
-    if (typeof(window) != undefined)
+    if (typeof(window) != "undefined")
       for(var variable in window)
         if(window[variable] == this)
           options.instanceName = variable;
diff --git a/src/modules/PixelManipulation.js b/src/modules/PixelManipulation.js
index de7b2a70..aa30cd79 100644
--- a/src/modules/PixelManipulation.js
+++ b/src/modules/PixelManipulation.js
@@ -22,7 +22,7 @@ module.exports = function PixelManipulation(image, options) {
     }
 
     // iterate through pixels;
-    // this could possibly be more efficient; see 
+    // this could possibly be more efficient; see
     // https://github.com/p-v-o-s/infragram-js/blob/master/public/infragram.js#L173-L181
     for(var x = 1; x < pixels.shape[0]; x++) {
       for(var y = 1; y < pixels.shape[1]; y++) {