diff --git a/src/allmydata/util/assertutil.py b/src/allmydata/util/assertutil.py
index 67083c2d4..21fae0411 100644
--- a/src/allmydata/util/assertutil.py
+++ b/src/allmydata/util/assertutil.py
@@ -18,4 +18,4 @@ if PY2:
 
 
 # The API importers expect:
-from pyutil.asserutil import _assert, precondition, postcondition
+from pyutil.assertutil import _assert, precondition, postcondition