diff --git a/adminsortable/admin.py b/adminsortable/admin.py
index ba88351..897c91a 100644
--- a/adminsortable/admin.py
+++ b/adminsortable/admin.py
@@ -25,8 +25,12 @@ class SortableAdmin(ModelAdmin):
         self.has_sortable_tabular_inlines = False
         self.has_sortable_stacked_inlines = False
         for klass in self.inlines:
-            if issubclass(klass, SortableTabularInline) and klass.model.is_sortable(): self.has_sortable_tabular_inlines = True
-            if issubclass(klass, SortableStackedInline) and klass.model.is_sortable(): self.has_sortable_stacked_inlines = True
+            if issubclass(klass, SortableTabularInline):
+                if klass.model.is_sortable():
+                    self.has_sortable_tabular_inlines = True
+            if issubclass(klass, SortableStackedInline):
+                if klass.model.is_sortable():
+                    self.has_sortable_stacked_inlines = True
 
     def get_urls(self):
         urls = super(SortableAdmin, self).get_urls()
diff --git a/sample_project/adminsortable.sqlite b/sample_project/adminsortable.sqlite
index 2cb981e..a3ce8f9 100644
Binary files a/sample_project/adminsortable.sqlite and b/sample_project/adminsortable.sqlite differ