diff --git a/django/bin/validate.py b/django/bin/validate.py
index f0c37d01cb..220c173edc 100644
--- a/django/bin/validate.py
+++ b/django/bin/validate.py
@@ -13,19 +13,27 @@ def validate_class(klass):
     # Fields.
     for f in opts.fields:
         if isinstance(f, meta.ManyToManyField):
-            assert isinstance(f.rel, meta.ManyToMany), "ManyToManyField %s should have 'rel' set to a ManyToMany instance." % f.name
+            assert isinstance(f.rel, meta.ManyToMany), \
+                "ManyToManyField %s should have 'rel' set to a ManyToMany instance." % f.name
     # Inline related objects.
     for rel_opts, rel_field in opts.get_inline_related_objects():
-        assert len([f for f in rel_opts.fields if f.core]) > 0, "At least one field in %s should have core=True, because it's being edited inline by %s." % (rel_opts.object_name, opts.object_name)
+        assert len([f for f in rel_opts.fields if f.core]) > 0, \
+            "At least one field in %s should have core=True, because it's being edited inline by %s." % \
+            (rel_opts.object_name, opts.object_name)
     # All related objects.
     related_apps_seen = []
     for rel_opts, rel_field in opts.get_all_related_objects():
         if rel_opts in related_apps_seen:
-            assert rel_field.rel.related_name is not None, "Relationship in field %s.%s needs to set 'related_name' because more than one %s object is referenced in %s." % (rel_opts.object_name, rel_field.name, opts.object_name, rel_opts.object_name)
+            assert rel_field.rel.related_name is not None, \
+                "Relationship in field %s.%s needs to set 'related_name' because more than one" \
+                " %s object is referenced in %s." % \
+                (rel_opts.object_name, rel_field.name, opts.object_name, rel_opts.object_name)
         related_apps_seen.append(rel_opts)
     # Etc.
     if opts.admin is not None:
-        assert opts.admin.ordering or opts.ordering, "%s needs to set 'ordering' on either its 'admin' or its model, because it has 'admin' set." % opts.object_name
+        assert opts.admin.ordering or opts.ordering, \
+            "%s needs to set 'ordering' on either its 'admin' or its model," \
+            " because it has 'admin' set." % opts.object_name
 
 if __name__ == "__main__":
     import sys