diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 02a5fed..0e22c0b 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -90,9 +90,9 @@
 	double			scale;
 	const char		*unit;
 	struct event_format	*tp_format;
+	off_t			id_offset;
 	union {
 		void		*priv;
-		off_t		id_offset;
 		u64		db_id;
 	};
 	struct cgroup_sel	*cgrp;