diff --git a/Lib/dis.py b/Lib/dis.py
index 4cf452a..6d52694 100644
--- a/Lib/dis.py
+++ b/Lib/dis.py
@@ -18,8 +18,8 @@
     if x is None:
         distb()
         return
-    if hasattr(x, 'im_func'):
-        x = x.im_func
+    if hasattr(x, '__func__'):
+        x = x.__func__
     if hasattr(x, '__code__'):
         x = x.__code__
     if hasattr(x, '__dict__'):