diff --git a/Doc/conf.py b/Doc/conf.py
index b218e3e7c0464e..34715918a5fe5b 100644
--- a/Doc/conf.py
+++ b/Doc/conf.py
@@ -561,6 +561,17 @@
 refcount_file = 'data/refcounts.dat'
 stable_abi_file = 'data/stable_abi.dat'
 
+# Options for notfound.extension
+# -------------------------------
+
+if not os.getenv("READTHEDOCS"):
+    if language_code:
+        notfound_urls_prefix = (
+            f'/{language_code.replace("_", "-").lower()}/{version}/'
+        )
+    else:
+        notfound_urls_prefix = f'/{version}/'
+
 # Options for sphinxext-opengraph
 # -------------------------------