diff --git a/tools/perf/util/annotate.h b/tools/perf/util/annotate.h
index 3763954..bb2e3f9 100644
--- a/tools/perf/util/annotate.h
+++ b/tools/perf/util/annotate.h
@@ -74,11 +74,15 @@
 	u64		addr[0];
 };
 
-struct source_line {
-	struct rb_node	node;
+struct source_line_percent {
 	double		percent;
 	double		percent_sum;
+};
+
+struct source_line {
+	struct rb_node	node;
 	char		*path;
+	struct source_line_percent p[1];
 };
 
 /** struct annotated_source - symbols with hits have this attached as in sannotation