diff --git a/src/utils/browser.js b/src/utils/browser.js
index 29ed7e13c7..0301564c38 100644
--- a/src/utils/browser.js
+++ b/src/utils/browser.js
@@ -116,6 +116,15 @@ dwv.browser.check = function()
             }
             return cloned;
         };
+        // basic Int16Array implementation
+        Int16Array.prototype.slice = function (begin, end) {
+            var size = end - begin;
+            var cloned = new Int16Array(size);
+            for (var i = 0; i < size; i++) {
+                cloned[i] = this[begin + i];
+            }
+            return cloned;
+        };
         // basic Uint8Array implementation
         Uint8Array.prototype.slice = function (begin, end) {
             var size = end - begin;
@@ -125,6 +134,15 @@ dwv.browser.check = function()
             }
             return cloned;
         };
+        // basic Int8Array implementation
+        Int8Array.prototype.slice = function (begin, end) {
+            var size = end - begin;
+            var cloned = new Int8Array(size);
+            for (var i = 0; i < size; i++) {
+                cloned[i] = this[begin + i];
+            }
+            return cloned;
+        };
     }
     // check clamped array
     if( !dwv.browser.hasClampedArray() ) {