diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index bc24997..8a0cbde 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -221,6 +221,7 @@
 	bool elide;
 	int len;
 	int user_len;
+	int idx;
 };
 
 extern struct list_head perf_hpp__list;