diff --git a/Doc/c-api/tuple.rst b/Doc/c-api/tuple.rst
index 08767393bc4..3922d50f80a 100644
--- a/Doc/c-api/tuple.rst
+++ b/Doc/c-api/tuple.rst
@@ -129,7 +129,7 @@ type.
    Initializes a struct sequence type *type* from *desc* in place.
 
 
-.. c:function:: void PyStructSequence_InitType2(PyTypeObject *type, PyStructSequence_Desc *desc)
+.. c:function:: int PyStructSequence_InitType2(PyTypeObject *type, PyStructSequence_Desc *desc)
 
    The same as ``PyStructSequence_InitType``, but returns ``0`` on success and ``-1`` on
    failure.