--- a/bindings/pyroot_legacy/src/PyROOT.h.old     2023-02-26 09:57:37.572520372 +0100
+++ b/bindings/pyroot_legacy/src/PyROOT.h 2023-02-26 09:57:58.270521746 +0100
@@ -106,7 +106,7 @@
 
 // Support non-ASCII strings
 #if PY_VERSION_HEX >= 0x03030000
-#define PyROOT_PyUnicode_AsStringAndSize    _PyUnicode_AsStringAndSize
+#define PyROOT_PyUnicode_AsStringAndSize    PyUnicode_AsUTFAndSize
 #endif
 
 // for 3.0 support (backwards compatibility, really)