diff --git a/Python/instrumentation.c b/Python/instrumentation.c
index 13bdd041becd69..494f6bb149e952 100644
--- a/Python/instrumentation.c
+++ b/Python/instrumentation.c
@@ -1235,8 +1235,9 @@ _Py_call_instrumentation_jump(
assert(event == PY_MONITORING_EVENT_JUMP ||
event == PY_MONITORING_EVENT_BRANCH_RIGHT ||
event == PY_MONITORING_EVENT_BRANCH_LEFT);
- int to = (int)(dest - _PyFrame_GetBytecode(frame));
- PyObject *to_obj = PyLong_FromLong(to * (int)sizeof(_Py_CODEUNIT));
+ Py_ssize_t to = (dest - _PyFrame_GetBytecode(frame));
+ assert(to <= PY_SSIZE_T_MAX / (Py_ssize_t)sizeof(_Py_CODEUNIT));
+ PyObject *to_obj = PyLong_FromSsize_t(to * sizeof(_Py_CODEUNIT));
if (to_obj == NULL) {
return NULL;
}
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