diff --git a/tailbone/views/email.py b/tailbone/views/email.py
index 39b96733..1349d4cc 100644
--- a/tailbone/views/email.py
+++ b/tailbone/views/email.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2019 Lance Edgar
+#  Copyright © 2010-2020 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -323,7 +323,7 @@ class EmailPreview(View):
         data = email.obtain_sample_data(self.request)
         self.request.response.text = template.render(**data)
         if type_ == 'txt':
-            self.request.response.content_type = b'text/plain'
+            self.request.response.content_type = str('text/plain')
         return self.request.response
 
     @classmethod