diff --git a/src/kemal.cr b/src/kemal.cr
index f3e17c1..09a9534 100644
--- a/src/kemal.cr
+++ b/src/kemal.cr
@@ -6,49 +6,6 @@ require "./kemal/*"
 require "./kemal/ext/*"
 require "./kemal/helpers/*"
 
-# This is literally `hack` to fix [Crystal issue #4060](https://github.com/crystal-lang/crystal/issues/4060)
-class Gzip::Header
-  def to_io(io)
-    # header
-    io.write_byte ID1
-    io.write_byte ID2
-
-    # compression method
-    io.write_byte DEFLATE
-
-    # flg
-    flg = Flg::None
-    flg |= Flg::EXTRA if !@extra.empty?
-    flg |= Flg::NAME if @name
-    flg |= Flg::COMMENT if @comment
-    io.write_byte flg.value
-
-    # time
-    io.write_bytes(modification_time.epoch.to_u32, IO::ByteFormat::LittleEndian)
-
-    # xfl
-    io.write_byte 0_u8
-
-    # os
-    io.write_byte os
-
-    if !@extra.empty?
-      io.write_byte @extra.size.to_u8
-      io.write(@extra)
-    end
-
-    if name = @name
-      io << name
-      io.write_byte 0_u8
-    end
-
-    if comment = @comment
-      io << comment
-      io.write_byte 0_u8
-    end
-  end
-end
-
 module Kemal
   # Overload of self.run with the default startup logging
   def self.run(port = nil)