diff --git a/src/js/utilities.js b/src/js/utilities.js
index fe2ec989..bd151e4a 100644
--- a/src/js/utilities.js
+++ b/src/js/utilities.js
@@ -50,7 +50,7 @@
     var newImage;
 
     // Modern browsers (ignore Safari, #120 & #509)
-    if (image.naturalWidth && !IS_SAFARI) {
+    if (image.naturalWidth && !IS_SAFARI_OR_UIWEBVIEW) {
       return callback(image.naturalWidth, image.naturalHeight);
     }
 
@@ -268,7 +268,7 @@
           orientation = dataView.getUint16(offset, littleEndian);
 
           // Override the orientation with its default value for Safari (#120)
-          if (IS_SAFARI) {
+          if (IS_SAFARI_OR_UIWEBVIEW) {
             dataView.setUint16(offset, 1, littleEndian);
           }
 
diff --git a/src/js/variables.js b/src/js/variables.js
index c6ff69b3..6a6e7ee7 100644
--- a/src/js/variables.js
+++ b/src/js/variables.js
@@ -65,7 +65,7 @@
 
   // Supports
   var SUPPORT_CANVAS = $.isFunction($('<canvas>')[0].getContext);
-  var IS_SAFARI = navigator && /safari/i.test(navigator.userAgent) && /apple computer/i.test(navigator.vendor);
+  var IS_SAFARI_OR_UIWEBVIEW = navigator && /(Macintosh|iPhone|iPod|iPad).*AppleWebKit/i.test(navigator.userAgent);
 
   // Maths
   var num = Number;