diff --git a/pseudodb/pseudodb.py b/pseudodb/pseudodb.py
index 6193fe1..85581bb 100644
--- a/pseudodb/pseudodb.py
+++ b/pseudodb/pseudodb.py
@@ -21,7 +21,7 @@ class PseudoDB:
         if self.data is not None:
             attr_names = []
             for attr_name in dir(self.data):
-                if not attr_name.startswith('__') and not attr_name == 'ar':
+                if not attr_name.startswith('__') and attr_name != 'ar':
                     collection = getattr(self.data, attr_name)
                     attr_names.append((attr_name, type(collection)))