diff --git a/docs/changelog.rst b/docs/changelog.rst
index 76b3d82..2569314 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,6 +1,13 @@
Changelog
=========
+* 2024-03-09: Add hash constants:
+
+ * ``PyHASH_BITS``
+ * ``PyHASH_IMAG``
+ * ``PyHASH_INF``
+ * ``PyHASH_MODULUS``
+
* 2024-02-20: Add PyTime API:
* ``PyTime_t`` type
diff --git a/pythoncapi_compat.h b/pythoncapi_compat.h
index ebf4cbe..43ba0dd 100644
--- a/pythoncapi_compat.h
+++ b/pythoncapi_compat.h
@@ -1196,6 +1196,18 @@ static inline int PyTime_PerfCounter(PyTime_t *result)
#endif
+// gh-111389 added hash constants to Python 3.13.0a5. These constants were
+// added first as private macros to Python 3.4.0b1 and PyPy 7.3.9.
+#if (!defined(PyHASH_BITS) \
+ && ((!defined(PYPY_VERSION) && PY_VERSION_HEX >= 0x030400B1) \
+ || (defined(PYPY_VERSION) && PY_VERSION_HEX >= 0x03070000 \
+ && PYPY_VERSION_NUM >= 0x07090000)))
+# define PyHASH_BITS _PyHASH_BITS
+# define PyHASH_MODULUS _PyHASH_MODULUS
+# define PyHASH_INF _PyHASH_INF
+# define PyHASH_IMAG _PyHASH_IMAG
+#endif
+
#ifdef __cplusplus
}
diff --git a/tests/test_pythoncapi_compat_cext.c b/tests/test_pythoncapi_compat_cext.c
index 94a2cfb..4e9fb83 100644
--- a/tests/test_pythoncapi_compat_cext.c
+++ b/tests/test_pythoncapi_compat_cext.c
@@ -1522,6 +1522,20 @@ test_hash(PyObject *Py_UNUSED(module), PyObject *Py_UNUSED(args))
assert(Py_HashPointer(ptr1) == (Py_hash_t)ptr1);
#endif
+#if ((!defined(PYPY_VERSION) && PY_VERSION_HEX >= 0x030400B1) \
+ || (defined(PYPY_VERSION) && PY_VERSION_HEX >= 0x03070000 \
+ && PYPY_VERSION_NUM >= 0x07090000))
+ // Just check that constants are available
+ size_t bits = PyHASH_BITS;
+ assert(bits >= 8);
+ size_t mod = PyHASH_MODULUS;
+ assert(mod >= 7);
+ size_t inf = PyHASH_INF;
+ assert(inf != 0);
+ size_t imag = PyHASH_IMAG;
+ assert(imag != 0);
+#endif
+
Py_RETURN_NONE;
}
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