diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 36f65e2..f274e19 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1791,7 +1791,7 @@
 	size += err;
 
 	list_for_each_entry(sub, &leader->sibling_list, list_entry) {
-		err = perf_counter_read_entry(counter, read_format,
+		err = perf_counter_read_entry(sub, read_format,
 				buf + size);
 		if (err < 0)
 			return err;