diff --git a/internal/chat/handler.go b/internal/chat/handler.go
index 42a4894..399c356 100644
--- a/internal/chat/handler.go
+++ b/internal/chat/handler.go
@@ -242,6 +242,14 @@ func (h *Handler) HandleChat(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// Enforce response language based on the CV language the user is viewing
+	switch lang := r.FormValue("lang"); lang {
+	case "en":
+		message = "[RESPOND IN ENGLISH] " + message
+	case "es":
+		message = "[RESPONDE EN ESPAÑOL] " + message
+	}
+
 	// Try primary, fall back if it fails
 	response, sessionID, err := h.runAgent(h.primary, message)
 	if err != nil && h.fallback != nil {