diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index c0b345b..e00dc37 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -9675,7 +9675,7 @@
     Py_UCS4 c, mapped[3];
 
     c = PyUnicode_READ(kind, data, 0);
-    n_res = _PyUnicode_ToUpperFull(c, mapped);
+    n_res = _PyUnicode_ToTitleFull(c, mapped);
     for (j = 0; j < n_res; j++) {
         *maxchar = Py_MAX(*maxchar, mapped[j]);
         res[k++] = mapped[j];