diff --git a/ietf/doc/views_doc.py b/ietf/doc/views_doc.py
index a99c192ba..6b2f9c3ea 100644
--- a/ietf/doc/views_doc.py
+++ b/ietf/doc/views_doc.py
@@ -870,12 +870,12 @@ def document_shepherd_writeup(request, name):
 
 def document_references(request, name):
     doc = get_object_or_404(Document,docalias__name=name)
-    refs = doc.relations_that_doc(['refnorm','refinfo','refunk','refold'])
+    refs = doc.relations_that_doc(('refnorm','refinfo','refunk','refold'))
     return render(request, "doc/document_references.html",dict(doc=doc,refs=sorted(refs,key=lambda x:x.target.name),))
 
 def document_referenced_by(request, name):
     doc = get_object_or_404(Document,docalias__name=name)
-    refs = doc.relations_that(['refnorm','refinfo','refunk','refold']).filter(source__states__type__slug='draft',source__states__slug__in=['rfc','active'])
+    refs = doc.relations_that(('refnorm','refinfo','refunk','refold')).filter(source__states__type__slug='draft',source__states__slug__in=['rfc','active'])
     full = ( request.GET.get('full') != None )
     numdocs = refs.count()
     if not full and numdocs>250:
diff --git a/ietf/ipr/tests.py b/ietf/ipr/tests.py
index 443219d4a..c18014640 100644
--- a/ietf/ipr/tests.py
+++ b/ietf/ipr/tests.py
@@ -168,7 +168,7 @@ class IprTests(TestCase):
 
     def test_iprs_for_drafts_recursive(self):
         draft = make_test_data()
-        replaced = draft.all_related_that_doc(['replaces'])
+        replaced = draft.all_related_that_doc('replaces')
         ipr = IprDisclosureBase.objects.get(title='Statement regarding rights')
         r = self.client.get(urlreverse("ietf.ipr.views.by_draft_recursive_txt"))
         self.assertEqual(r.status_code, 200)
diff --git a/ietf/ipr/views.py b/ietf/ipr/views.py
index cc6cf35f2..6be8ee068 100644
--- a/ietf/ipr/views.py
+++ b/ietf/ipr/views.py
@@ -461,7 +461,7 @@ def by_draft_recursive_txt(request):
         alias = o.document
         document = alias.document
         name = alias.name
-        related = set(document.docalias_set.all()) | set(document.all_related_that_doc(['obs', 'replaces']))
+        related = set(document.docalias_set.all()) | set(document.all_related_that_doc(('obs', 'replaces')))
         for alias in related:
             name = alias.name
             if name.startswith("rfc"):
@@ -671,7 +671,7 @@ def search(request):
                     docs = related_docs(first)
                     iprs = iprs_from_docs(docs,states=states)
                     template = "ipr/search_doc_result.html"
-                    updated_docs = related_docs(first, ['updates',])
+                    updated_docs = related_docs(first, ('updates',))
                     related_iprs = list(set(iprs_from_docs(updated_docs, states=states)) - set(iprs))
                 # multiple matches, select just one
                 elif start:
diff --git a/ietf/mailtrigger/models.py b/ietf/mailtrigger/models.py
index 3b5c7b6e9..d990f2004 100644
--- a/ietf/mailtrigger/models.py
+++ b/ietf/mailtrigger/models.py
@@ -91,35 +91,35 @@ class Recipient(models.Model):
     def gather_doc_affecteddoc_authors(self, **kwargs):
         addrs = []
         if 'doc' in kwargs:
-            for reldoc in kwargs['doc'].related_that_doc(['conflrev','tohist','tois','tops']):
+            for reldoc in kwargs['doc'].related_that_doc(('conflrev','tohist','tois','tops')):
                 addrs.extend(Recipient.objects.get(slug='doc_authors').gather(**{'doc':reldoc.document}))
         return addrs
 
     def gather_doc_affecteddoc_group_chairs(self, **kwargs):
         addrs = []
         if 'doc' in kwargs:
-            for reldoc in kwargs['doc'].related_that_doc(['conflrev','tohist','tois','tops']):
+            for reldoc in kwargs['doc'].related_that_doc(('conflrev','tohist','tois','tops')):
                 addrs.extend(Recipient.objects.get(slug='doc_group_chairs').gather(**{'doc':reldoc.document}))
         return addrs
 
     def gather_doc_affecteddoc_notify(self, **kwargs):
         addrs = []
         if 'doc' in kwargs:
-            for reldoc in kwargs['doc'].related_that_doc(['conflrev','tohist','tois','tops']):
+            for reldoc in kwargs['doc'].related_that_doc(('conflrev','tohist','tois','tops')):
                 addrs.extend(Recipient.objects.get(slug='doc_notify').gather(**{'doc':reldoc.document}))
         return addrs
 
     def gather_conflict_review_stream_manager(self, **kwargs):
         addrs = []
         if 'doc' in kwargs:
-            for reldoc in kwargs['doc'].related_that_doc(['conflrev']):
+            for reldoc in kwargs['doc'].related_that_doc(('conflrev',)):
                 addrs.extend(Recipient.objects.get(slug='doc_stream_manager').gather(**{'doc':reldoc.document}))
         return addrs
 
     def gather_conflict_review_steering_group(self,**kwargs):
         addrs = []
         if 'doc' in kwargs:
-            for reldoc in kwargs['doc'].related_that_doc(['conflrev']):
+            for reldoc in kwargs['doc'].related_that_doc(('conflrev',)):
                 if reldoc.document.stream_id=='irtf':
                     addrs.append('"Internet Research Steering Group" <irsg@irtf.org>')
         return addrs