diff --git a/lib/net/http/response.rb b/lib/net/http/response.rb
index 7c89876d44..5a94f95694 100644
--- a/lib/net/http/response.rb
+++ b/lib/net/http/response.rb
@@ -264,7 +264,7 @@ class Net::HTTPResponse
     when 'deflate', 'gzip', 'x-gzip' then
       self.delete 'content-encoding'
 
-      inflate_body_io = Inflater.new(@socket, v.downcase == "deflate")
+      inflate_body_io = Inflater.new(@socket)
 
       begin
         yield inflate_body_io
@@ -358,10 +358,10 @@ class Net::HTTPResponse
     ##
     # Creates a new Inflater wrapping +socket+
 
-    def initialize(socket, raw_deflate)
+    def initialize socket
       @socket = socket
       # zlib with automatic gzip detection
-      @inflate = Zlib::Inflate.new(raw_deflate ? -Zlib::MAX_WBITS : 32 + Zlib::MAX_WBITS)
+      @inflate = Zlib::Inflate.new(32 + Zlib::MAX_WBITS)
     end
 
     ##
diff --git a/test/net/http/test_httpresponse.rb b/test/net/http/test_httpresponse.rb
index 14a804df1c..a03bb2e152 100644
--- a/test/net/http/test_httpresponse.rb
+++ b/test/net/http/test_httpresponse.rb
@@ -107,9 +107,9 @@ EOS
 HTTP/1.1 200 OK
 Connection: close
 Content-Encoding: deflate
-Content-Length: 7
+Content-Length: 13
 
-\xCBH\xCD\xC9\xC9\a\x00
+x\x9C\xCBH\xCD\xC9\xC9\a\x00\x06,\x02\x15
 EOS
 
     res = Net::HTTPResponse.read_new(io)
@@ -126,7 +126,7 @@ EOS
       assert_equal 'hello', body
     else
       assert_equal 'deflate', res['content-encoding']
-      assert_equal "\xCBH\xCD\xC9\xC9\a\x00", body
+      assert_equal "x\x9C\xCBH\xCD\xC9\xC9\a\x00\x06,\x02\x15", body
     end
   end
 
@@ -135,9 +135,9 @@ EOS
 HTTP/1.1 200 OK
 Connection: close
 Content-Encoding: DEFLATE
-Content-Length: 7
+Content-Length: 13
 
-\xCBH\xCD\xC9\xC9\a\x00
+x\x9C\xCBH\xCD\xC9\xC9\a\x00\x06,\x02\x15
 EOS
 
     res = Net::HTTPResponse.read_new(io)
@@ -154,7 +154,7 @@ EOS
       assert_equal 'hello', body
     else
       assert_equal 'DEFLATE', res['content-encoding']
-      assert_equal "\xCBH\xCD\xC9\xC9\a\x00", body
+      assert_equal "x\x9C\xCBH\xCD\xC9\xC9\a\x00\x06,\x02\x15", body
     end
   end
 
@@ -165,10 +165,10 @@ Connection: close
 Content-Encoding: deflate
 Transfer-Encoding: chunked
 
-4
-\xCBH\xCD\xC9
-3
-\xC9\a\x00
+6
+x\x9C\xCBH\xCD\xC9
+7
+\xC9\a\x00\x06,\x02\x15
 0
 
 EOS
@@ -187,7 +187,7 @@ EOS
       assert_equal 'hello', body
     else
       assert_equal 'deflate', res['content-encoding']
-      assert_equal "\xCBH\xCD\xC9\xC9\a\x00", body
+      assert_equal "x\x9C\xCBH\xCD\xC9\xC9\a\x00\x06,\x02\x15", body
     end
   end
 
@@ -196,9 +196,9 @@ EOS
 HTTP/1.1 200 OK
 Connection: close
 Content-Encoding: deflate
-Content-Length: 7
+Content-Length: 13
 
-\xCBH\xCD\xC9\xC9\a\x00
+x\x9C\xCBH\xCD\xC9\xC9\a\x00\x06,\x02\x15
 EOS
 
     res = Net::HTTPResponse.read_new(io)
@@ -211,7 +211,7 @@ EOS
     end
 
     assert_equal 'deflate', res['content-encoding'], 'Bug #7831'
-    assert_equal "\xCBH\xCD\xC9\xC9\a\x00", body, 'Bug #7381'
+    assert_equal "x\x9C\xCBH\xCD\xC9\xC9\a\x00\x06,\x02\x15", body, 'Bug #7381'
   end
 
   def test_read_body_content_encoding_deflate_no_length
@@ -220,7 +220,7 @@ HTTP/1.1 200 OK
 Connection: close
 Content-Encoding: deflate
 
-\xCBH\xCD\xC9\xC9\a\x00
+x\x9C\xCBH\xCD\xC9\xC9\a\x00\x06,\x02\x15
 EOS
 
     res = Net::HTTPResponse.read_new(io)
@@ -237,7 +237,7 @@ EOS
       assert_equal 'hello', body
     else
       assert_equal 'deflate', res['content-encoding']
-      assert_equal "\xCBH\xCD\xC9\xC9\a\x00\r\n", body
+      assert_equal "x\x9C\xCBH\xCD\xC9\xC9\a\x00\x06,\x02\x15\r\n", body
     end
   end