diff --git a/kallithea/controllers/changeset.py b/kallithea/controllers/changeset.py
--- a/kallithea/controllers/changeset.py
+++ b/kallithea/controllers/changeset.py
@@ -25,6 +25,7 @@ Original author and date, and relevant c
 :license: GPLv3, see LICENSE.md for more details.
 """
 
+import binascii
 import logging
 import traceback
 from collections import OrderedDict, defaultdict
@@ -395,6 +396,8 @@ class ChangesetController(BaseRepoContro
             c.changeset = c.cs_ranges[0]
             c.parent_tmpl = ''.join(['# Parent  %s\n' % x.raw_id
                                      for x in c.changeset.parents])
+            c.changeset_graft_source_hash = c.changeset.extra.get(b'source', b'')
+            c.changeset_transplant_source_hash = binascii.hexlify(c.changeset.extra.get(b'transplant_source', b''))
         if method == 'download':
             response.content_type = 'text/plain'
             response.content_disposition = 'attachment; filename=%s.diff' \
diff --git a/kallithea/templates/changeset/changeset.html b/kallithea/templates/changeset/changeset.html
--- a/kallithea/templates/changeset/changeset.html
+++ b/kallithea/templates/changeset/changeset.html
@@ -90,16 +90,14 @@ ${self.repo_context_bar('changelog', c.c
                          <span><b>${h.person(c.changeset.author,'full_name_and_username')}</b> - ${h.age(c.changeset.date,True)} ${h.fmt_date(c.changeset.date)}</span><br/>
                          <span>${h.email_or_none(c.changeset.author)}</span><br/>
                      </div>
-                     <% rev = c.changeset.extra.get('source') %>
-                     %if rev:
+                     %if c.changeset_graft_source_hash:
                      <div>
-                       ${_('Grafted from:')} ${h.link_to(h.short_id(rev),h.url('changeset_home',repo_name=c.repo_name,revision=rev), class_="changeset_hash")}
+                       ${_('Grafted from:')} ${h.link_to(h.short_id(c.changeset_graft_source_hash),h.url('changeset_home',repo_name=c.repo_name,revision=c.changeset_graft_source_hash), class_="changeset_hash")}
                      </div>
                      %endif
-                     <% rev = c.changeset.extra.get('transplant_source', '').encode('hex') %>
-                     %if rev:
+                     %if c.changeset_transplant_source_hash:
                      <div>
-                       ${_('Transplanted from:')} ${h.link_to(h.short_id(rev),h.url('changeset_home',repo_name=c.repo_name,revision=rev), class_="changeset_hash")}
+                       ${_('Transplanted from:')} ${h.link_to(h.short_id(c.changeset_transplant_source_hash),h.url('changeset_home',repo_name=c.repo_name,revision=c.changeset_transplant_source_hash), class_="changeset_hash")}
                      </div>
                      %endif