diff --git a/Lib/test/test_zoneinfo/test_zoneinfo.py b/Lib/test/test_zoneinfo/test_zoneinfo.py
index 1f1fa60..8570326 100644
--- a/Lib/test/test_zoneinfo/test_zoneinfo.py
+++ b/Lib/test/test_zoneinfo/test_zoneinfo.py
@@ -462,7 +462,7 @@
     pass
 
 
-class ZoneInfoTestSubclass(ZoneInfoTest):
+class ZoneInfoSubclassTest(ZoneInfoTest):
     @classmethod
     def setUpClass(cls):
         super().setUpClass()
@@ -483,7 +483,7 @@
         self.assertIsInstance(sub_obj, self.klass)
 
 
-class CZoneInfoTestSubclass(ZoneInfoTest):
+class CZoneInfoSubclassTest(ZoneInfoSubclassTest):
     module = c_zoneinfo
 
 
diff --git a/Misc/NEWS.d/next/Library/2020-06-18-10-34-59.bpo-41025.elf_nz.rst b/Misc/NEWS.d/next/Library/2020-06-18-10-34-59.bpo-41025.elf_nz.rst
new file mode 100644
index 0000000..21e184d
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-06-18-10-34-59.bpo-41025.elf_nz.rst
@@ -0,0 +1,2 @@
+Fixed an issue preventing the C implementation of :class:`zoneinfo.ZoneInfo`
+from being subclassed.
diff --git a/Modules/_zoneinfo.c b/Modules/_zoneinfo.c
index bee84cb..12b3969 100644
--- a/Modules/_zoneinfo.c
+++ b/Modules/_zoneinfo.c
@@ -2557,7 +2557,7 @@
     {"_unpickle", (PyCFunction)zoneinfo__unpickle, METH_VARARGS | METH_CLASS,
      PyDoc_STR("Private method used in unpickling.")},
     {"__init_subclass__", (PyCFunction)(void (*)(void))zoneinfo_init_subclass,
-     METH_VARARGS | METH_KEYWORDS,
+     METH_VARARGS | METH_KEYWORDS | METH_CLASS,
      PyDoc_STR("Function to initialize subclasses.")},
     {NULL} /* Sentinel */
 };