diff --git a/freedreno/freedreno_ringbuffer.h b/freedreno/freedreno_ringbuffer.h
index c501fbad..0a3d6f77 100644
--- a/freedreno/freedreno_ringbuffer.h
+++ b/freedreno/freedreno_ringbuffer.h
@@ -47,6 +47,11 @@ struct fd_ringbuffer {
 	const struct fd_ringbuffer_funcs *funcs;
 	uint32_t last_timestamp;
 	struct fd_ringbuffer *parent;
+
+	/* for users of fd_ringbuffer to store their own private per-
+	 * ringbuffer data
+	 */
+	void *user;
 };
 
 struct fd_ringbuffer * fd_ringbuffer_new(struct fd_pipe *pipe,