diff --git a/IPython/utils/dir2.py b/IPython/utils/dir2.py
index f6f164f..62797ae 100644
--- a/IPython/utils/dir2.py
+++ b/IPython/utils/dir2.py
@@ -41,6 +41,9 @@ def dir2(obj):
         # TypeError: dir(obj) does not return a list
         words = set()
 
+    if safe_hasattr(obj, '__class__'):
+        words |= set(dir(obj.__class__))
+
     # filter out non-string attributes which may be stuffed by dir() calls
     # and poor coding in third-party modules