diff --git a/lib/cmess/guess_encoding/automatic.rb b/lib/cmess/guess_encoding/automatic.rb
index 7173b86..8b99e74 100644
--- a/lib/cmess/guess_encoding/automatic.rb
+++ b/lib/cmess/guess_encoding/automatic.rb
@@ -216,7 +216,7 @@ def next_one_of?(*bytes)
     bytes.include?(next_byte)
   end
 
-  def read(chunk_size = chunk_size)
+  def read(chunk_size = chunk_size())
     @byte_count ||= Hash.new(0)
     @byte_total ||= 0