diff --git a/lib/zlib/deflate.js b/lib/zlib/deflate.js
index 7691a91..33e3a6f 100644
--- a/lib/zlib/deflate.js
+++ b/lib/zlib/deflate.js
@@ -660,8 +660,8 @@ function deflateInit2(strm, level, method, windowBits, memLevel, strategy) {
   s.method = method;
 
   // precreate & prefill head/prev arrays to optimize v8 types
-  s.head = new Array(s.hash_size);
-  s.prev = new Array(s.w_size);
+  s.head = utils.array16Create(s.hash_size);
+  s.prev = utils.array16Create(s.w_size);
   utils.fill(s.head, 0);
   utils.fill(s.prev, 0);
 
@@ -804,6 +804,7 @@ function deflate(strm, flush) {
          */
         if (flush === c.Z_FULL_FLUSH) {
           //CLEAR_HASH(s);             /* forget history */
+// !!!! seems to be bug -> 0 in original
           s.head[s.hash_size - 1] = -1;
 
           if (s.lookahead === 0) {
diff --git a/lib/zlib/utils.js b/lib/zlib/utils.js
index f1546f5..0f3fd9f 100644
--- a/lib/zlib/utils.js
+++ b/lib/zlib/utils.js
@@ -56,10 +56,21 @@ exports.arrayCreate = function (length) {
 };
 
 
+exports.array16Create = function (length) {
+
+  if ((typeof Uint16Array !== 'undefined')) {
+    return new Uint16Array(length);
+  }
+
+  // Fallback to ordinary array
+  return new Array(length);
+};
+
+
 exports.fill = function (buf, val) {
   var len = buf.length;
 
   if (!len) { return;}
 
-  while (--len) { buf[len] = val}
-}
\ No newline at end of file
+  while (--len) { buf[len] = val; }
+};