diff --git a/hgdemandimport/__init__.py b/hgdemandimport/__init__.py
index 7b8769cca23dc78e9dd0f0eec52dcc467c76ddcb_aGdkZW1hbmRpbXBvcnQvX19pbml0X18ucHk=..141ed0bf72a1fe00f5a9ea105bb042a182c56fc5_aGdkZW1hbmRpbXBvcnQvX19pbml0X18ucHk= 100644
--- a/hgdemandimport/__init__.py
+++ b/hgdemandimport/__init__.py
@@ -62,6 +62,7 @@
     '_weakrefset',
     'warnings',
     'threading',
+    'collections.abc',
 }
 
 _pypy = '__pypy__' in sys.builtin_module_names