diff --git a/immutabledict/__init__.py b/immutabledict/__init__.py
index 95ff458..0cbdac4 100644
--- a/immutabledict/__init__.py
+++ b/immutabledict/__init__.py
@@ -4,7 +4,7 @@
 
 if sys.version_info >= (3, 7):
     from typing import Mapping
-else:
+else:  # pragma: no cover
     from collections.abc import Mapping as _BaseMapping
 
     class _MappingMeta(type):