diff --git a/tools/testing/selftests/timers/clocksource-switch.c b/tools/testing/selftests/timers/clocksource-switch.c
index 3ef2146280678..bfc974b4572d5 100644
--- a/tools/testing/selftests/timers/clocksource-switch.c
+++ b/tools/testing/selftests/timers/clocksource-switch.c
@@ -50,7 +50,7 @@ int get_clocksources(char list[][30])
 
 	close(fd);
 
-	for (i = 0; i < 30; i++)
+	for (i = 0; i < 10; i++)
 		list[i][0] = '\0';
 
 	head = buf;