diff --git a/pyaccuwage/fields.py b/pyaccuwage/fields.py
index 495aa5c..052298f 100644
--- a/pyaccuwage/fields.py
+++ b/pyaccuwage/fields.py
@@ -220,7 +220,7 @@ class CRLFField(TextField):
     value = property(__getvalue, __setvalue)
 
     def get_data(self):
-        return '\r\n'
+        return b'\r\n'
 
     def parse(self, s):
         self.value = s