diff --git a/src/modules/transport/transport.c b/src/modules/transport/transport.c
index 1bb4aa2..33a8d06 100644
--- a/src/modules/transport/transport.c
+++ b/src/modules/transport/transport.c
@@ -319,5 +319,11 @@ struct App_Error transport_send_frame(struct Transport_Conn *conn,
 }
 
 void transport_conn_close(struct Transport_Conn *conn) {
-	close(conn->fd);
+	/* shutdown() rather than close(): signals EOF to the remote end and
+	 * unblocks the read thread without releasing the fd.  The read thread
+	 * is the sole owner of the fd and will close() it when it exits.
+	 * Using close() here would create a race where the fd number could be
+	 * reused by the next transport_connect() before the detached read
+	 * thread calls its own close(), which would then close the wrong fd. */
+	shutdown(conn->fd, SHUT_RDWR);
 }