diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index 9b50076449bd..068d297aaf44 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -1158,7 +1158,6 @@ static void draw_io_bars(struct timechart *tchart)
 			}
 
 			svg_box(Y, c->start_time, c->end_time, "process3");
-			sample = c->io_samples;
 			for (sample = c->io_samples; sample; sample = sample->next) {
 				double h = (double)sample->bytes / c->max_bytes;