diff --git a/changelog.d/963.bugfix.rst b/changelog.d/963.bugfix.rst
new file mode 100644
index 000000000..2b1aabc0c
--- /dev/null
+++ b/changelog.d/963.bugfix.rst
@@ -0,0 +1,2 @@
+Fixed issue where ``dateutil.tz`` was using a backport of ``contextlib.nullcontext``
+even in Python 3.7 due to a malformed import statement.
diff --git a/dateutil/tz/tz.py b/dateutil/tz/tz.py
index 9d64c37a9..2460b5ed5 100644
--- a/dateutil/tz/tz.py
+++ b/dateutil/tz/tz.py
@@ -1823,7 +1823,7 @@ def _get_supported_offset(second_offset):
 
 try:
     # Python 3.7 feature
-    from contextmanager import nullcontext as _nullcontext
+    from contextlib import nullcontext as _nullcontext
 except ImportError:
     class _nullcontext(object):
         """