diff --git a/artiq/language/core.py b/artiq/language/core.py
index fb8304bfd..f21877365 100644
--- a/artiq/language/core.py
+++ b/artiq/language/core.py
@@ -1,4 +1,3 @@
-import itertools
 from collections import namedtuple
 
 from artiq.language import units