diff --git a/unibabel.base32.js b/unibabel.base32.js
index 9b57d7c..219f815 100644
--- a/unibabel.base32.js
+++ b/unibabel.base32.js
@@ -131,7 +131,12 @@ exports.base32ToBuffer = function(encoded) {
             throw new Error('Invalid input - it is not base32 encoded string');
         }
     }
-    return decoded.slice(0, plainPos);
+    if (decoded.slice) {
+      return decoded.slice(0, plainPos);
+    } else {
+      // Mobile Safari's Uint8Array doesn't have slice
+      return Array.prototype.slice.call(decoded, 0, plainPos);
+    }
 };
 
 }(window.Unibabel || window));