diff --git a/lib/websocket/http/headers.rb b/lib/websocket/http/headers.rb
index cfe937c..135a8d8 100644
--- a/lib/websocket/http/headers.rb
+++ b/lib/websocket/http/headers.rb
@@ -55,8 +55,10 @@ def error?
 
       def parse(chunk)
         chunk.each_byte do |octet|
-          @size += 1
-          return error if @size > MAX_REQUEST_SIZE
+          if @stage < 2
+            @size += 1
+            return error if @size > MAX_REQUEST_SIZE
+          end
 
           if octet == LF and @stage < 2
             @buffer.pop if @buffer.last == CR