diff --git a/pymbolic/primitives.py b/pymbolic/primitives.py
index 53f184a406478c0ef2eaee76532cef53f0b4b93c..7009199a4afdeac8d32497d63bd093ef7b5b4f76 100644
--- a/pymbolic/primitives.py
+++ b/pymbolic/primitives.py
@@ -379,7 +379,7 @@ class Expression(object):
 
     # {{{ bitwise operators
 
-    def __inv__(self):
+    def __invert__(self):
         return BitwiseNot(self)
 
     def __or__(self, other):