diff --git a/newsfragments/4450.changed.md b/newsfragments/4450.changed.md
new file mode 100644
index 00000000000..efc02fc3032
--- /dev/null
+++ b/newsfragments/4450.changed.md
@@ -0,0 +1 @@
+Restore `_PyLong_NumBits` on Python 3.13 and later
diff --git a/pyo3-ffi/src/longobject.rs b/pyo3-ffi/src/longobject.rs
index 35a2bc1b0ff..25fa12dbbfc 100644
--- a/pyo3-ffi/src/longobject.rs
+++ b/pyo3-ffi/src/longobject.rs
@@ -92,7 +92,6 @@ extern "C" {
 #[cfg(not(Py_LIMITED_API))]
 extern "C" {
     #[cfg_attr(PyPy, link_name = "_PyPyLong_NumBits")]
-    #[cfg(not(Py_3_13))]
     pub fn _PyLong_NumBits(obj: *mut PyObject) -> size_t;
 }