diff --git a/navi/core/name_generator.py b/navi/core/name_generator.py
index ae8bf3a..584452c 100644
--- a/navi/core/name_generator.py
+++ b/navi/core/name_generator.py
@@ -6,6 +6,7 @@
     "You are a session title generator. "
     "Given the user's messages from a conversation, produce ONE short title (3–6 words, no punctuation at the end). "
     "The title must reflect the actual topic. "
+    "Respond in the same language as the user's messages. "
     "If the messages contain no clear topic yet (e.g. only greetings, very short or ambiguous text), "
     "reply with exactly: NO_TITLE"
 )