diff --git a/blti/roles.py b/blti/roles.py
index 31a15c8..bce0634 100644
--- a/blti/roles.py
+++ b/blti/roles.py
@@ -5,6 +5,7 @@
 LTI_1p3_ROLES_CLAIM = "https://purl.imsglobal.org/spec/lti/claim/roles"
 LTI_1p3_ROLE_PREFIX = "http://purl.imsglobal.org/vocab/lis/v2/"
 
+
 def roles_from_role_name(role_names):
     roles = []
 
@@ -12,9 +13,10 @@ def roles_from_role_name(role_names):
         if role_name == 'User':
             roles += ["system/person#User"]
         elif role_name in ['Observer', 'Mentor']:
-            roles += ["institution/person#Observer",
-                     "institution/person#Mentor",
-                     "membership#Mentor"]
+            roles += [
+                "institution/person#Observer",
+                "institution/person#Mentor",
+                "membership#Mentor"]
         elif role_name in ['Student', 'Learner']:
             roles += [
                 "institution/person#Learner",