diff --git a/CHANGELOG.md b/CHANGELOG.md
index 72e3b64..7831ff7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,15 @@
 Change Log
 ==========================
 
+5.1.0
+--------------------------
+
+### Fixes
+
+- Fix chunk size.
+
+
+
 5.0.0
 --------------------------
 
diff --git a/Sources/Gzip/Data+Gzip.swift b/Sources/Gzip/Data+Gzip.swift
index 903abbd..6250aa6 100644
--- a/Sources/Gzip/Data+Gzip.swift
+++ b/Sources/Gzip/Data+Gzip.swift
@@ -285,7 +285,7 @@ extension Data {
 
 private struct DataSize {
     
-    static let chunk = 2 ^ 14
+    static let chunk = 1 << 14
     static let stream = MemoryLayout<z_stream>.size
     
     private init() { }