diff --git a/ckan/views/__init__.py b/ckan/views/__init__.py
index b39fef0fee3..cdaf109ac2e 100644
--- a/ckan/views/__init__.py
+++ b/ckan/views/__init__.py
@@ -62,12 +62,12 @@ def set_cors_headers_for_response(response):
             cors_origin_allowed = request.headers.get(u'Origin')
 
         if cors_origin_allowed is not None:
-            response.headers[u'Access-Control-Allow-Origin'] = \
+            response.headers[b'Access-Control-Allow-Origin'] = \
                 cors_origin_allowed
-            response.headers[u'Access-Control-Allow-Methods'] = \
-                u'POST, PUT, GET, DELETE, OPTIONS'
-            response.headers[u'Access-Control-Allow-Headers'] = \
-                u'X-CKAN-API-KEY, Authorization, Content-Type'
+            response.headers[b'Access-Control-Allow-Methods'] = \
+                b'POST, PUT, GET, DELETE, OPTIONS'
+            response.headers[b'Access-Control-Allow-Headers'] = \
+                b'X-CKAN-API-KEY, Authorization, Content-Type'
 
     return response