diff --git a/Doc/c-api/unicode.rst b/Doc/c-api/unicode.rst
index 4ef437c6ce1..8932915da9b 100644
--- a/Doc/c-api/unicode.rst
+++ b/Doc/c-api/unicode.rst
@@ -1035,7 +1035,7 @@ They all return *NULL* or ``-1`` if an exception occurs.
    Unicode string.
 
 
-.. c:function:: int PyUnicode_Tailmatch(PyObject *str, PyObject *substr, Py_ssize_t start, Py_ssize_t end, int direction)
+.. c:function:: Py_ssize_t PyUnicode_Tailmatch(PyObject *str, PyObject *substr, Py_ssize_t start, Py_ssize_t end, int direction)
 
    Return 1 if *substr* matches ``str[start:end]`` at the given tail end
    (*direction* == -1 means to do a prefix match, *direction* == 1 a suffix match),