diff --git a/openpype/hosts/maya/api/plugin.py b/openpype/hosts/maya/api/plugin.py
index 2c5d1f1def..f434d1416c 100644
--- a/openpype/hosts/maya/api/plugin.py
+++ b/openpype/hosts/maya/api/plugin.py
@@ -159,20 +159,23 @@ class ReferenceLoader(Loader):
                 )
             elif custom_naming.strip()[0] == ':':
                 raise ValueError(
-                    "Wrong format for namespace, \
-missing content before ':' separator"
+                    "Wrong format for namespace, missing content before ':' "
+                    "separator"
                 )
             elif custom_naming.strip()[-1] == ':':
                 raise ValueError(
-                    "Wrong format for namespace, \
-missing content after ':' separator"
+                    "Wrong format for namespace, missing content after ':' "
+                    "separator"
                 )
 
             custom_naming = custom_naming.format(
                 asset_name=asset['name'],
                 asset_type=asset['type'],
                 subset=subset['name'],
-                family=subset['data'].get('family') or subset['data']['families'][0]  # noqa
+                family=(
+                    subset['data'].get('family') or
+                    subset['data']['families'][0]
+                )
             )
 
             namespace = custom_naming.split(':')[0]