diff --git a/bookwyrm/templatetags/utilities.py b/bookwyrm/templatetags/utilities.py
index 229a3d0b1..7e771a179 100644
--- a/bookwyrm/templatetags/utilities.py
+++ b/bookwyrm/templatetags/utilities.py
@@ -73,17 +73,18 @@ def get_book_cover_thumbnail(book, size="medium", ext="jpg"):
 @register.filter(name="get_isni_bio")
 def get_isni_bio(existing, author):
     """Returns the isni bio string if an existing author has an isni listed"""
-    auth_isni = re.sub("\D","",str(author.isni))
+    auth_isni = re.sub(r"\D", "", str(author.isni))
     if len(existing) == 0:
         return ""
     for value in existing:
-        if "bio" in value and auth_isni == re.sub("\D","",str(value["isni"])):
+        if "bio" in value and auth_isni == re.sub(r"\D", "", str(value["isni"])):
             return value["bio"]
 
     return ""
 
+
 @register.filter(name="remove_spaces")
 @stringfilter
 def remove_spaces(arg):
     """Removes spaces from argument passed in"""
-    return re.sub("\s","",str(arg))
+    return re.sub(r"\s", "", str(arg))
diff --git a/bookwyrm/views/books/edit_book.py b/bookwyrm/views/books/edit_book.py
index 939d99d0f..177ee7089 100644
--- a/bookwyrm/views/books/edit_book.py
+++ b/bookwyrm/views/books/edit_book.py
@@ -1,6 +1,6 @@
 """ the good stuff! the books! """
-from dateutil.parser import parse as dateparse
 from re import sub
+from dateutil.parser import parse as dateparse
 from django.contrib.auth.decorators import login_required, permission_required
 from django.contrib.postgres.search import SearchRank, SearchVector
 from django.db import transaction
@@ -75,7 +75,7 @@ class EditBook(View):
                     i
                     for i in isni_authors
                     for a in author_matches
-                    if sub("\D","",str(i["isni"])) == sub("\D","",str(a.isni))
+                    if sub(r"\D", "", str(i["isni"])) == sub(r"\D", "", str(a.isni))
                 ]
 
                 # pylint: disable=cell-var-from-loop