diff --git a/iiod-responder.c b/iiod-responder.c
index d654602e6..e4f1dec93 100644
--- a/iiod-responder.c
+++ b/iiod-responder.c
@@ -571,6 +571,7 @@ int iiod_io_get_response_async(struct iiod_io *io,
 		for (tmp = priv->readers; tmp->r_next; )
 			tmp = tmp->r_next;
 		tmp->r_next = io;
+		io->r_next = NULL;
 	}
 
 	iio_mutex_unlock(priv->lock);