---
 Modules/readline.c |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

Index: Python-3.13.9/Modules/readline.c
===================================================================
--- Python-3.13.9.orig/Modules/readline.c	2025-10-14 15:52:31.000000000 +0200
+++ Python-3.13.9/Modules/readline.c	2025-11-20 00:46:45.594286346 +0100
@@ -175,6 +175,8 @@
     return PyUnicode_DecodeLocale(s, "surrogateescape");
 }
 
+static int _py_get_history_length(void);
+static void _py_free_history_entry(HIST_ENTRY *entry);
 
 /*
 Explicitly disable bracketed paste in the interactive interpreter, even if it's
@@ -399,6 +401,27 @@
 /*[clinic end generated code: output=e161a53e45987dc7 input=b8901bf16488b760]*/
 {
     _history_length = length;
+
+    if (length < 0) {
+        stifle_history(-1);
+    }
+    else {
+        int current_length = _py_get_history_length();
+        if (length < current_length) {
+#if defined(RL_READLINE_VERSION) && RL_READLINE_VERSION >= 0x0500
+            HISTORY_STATE *state = history_get_history_state();
+            if (state) {
+                int i;
+                for (i = 0; i < current_length - length; i++) {
+                    _py_free_history_entry(remove_history(0));
+                }
+                state->length = length;
+                free(state);
+            }
+#endif
+        }
+        stifle_history(length);
+    }
     Py_RETURN_NONE;
 }