diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h
index 1c6b843b8c4e..04541dfbd44c 100644
--- a/samples/trace_events/trace-events-sample.h
+++ b/samples/trace_events/trace-events-sample.h
@@ -302,6 +302,7 @@ TRACE_EVENT(foo_bar,
 		__bitmask(	cpus,	num_possible_cpus()	)
 		__cpumask(	cpum				)
 		__vstring(	vstr,	fmt,	va		)
+		__string_len(	lstr,	foo,	bar / 2 < strlen(foo) ? bar / 2 : strlen(foo) )
 	),
 
 	TP_fast_assign(
@@ -310,12 +311,13 @@ TRACE_EVENT(foo_bar,
 		memcpy(__get_dynamic_array(list), lst,
 		       __length_of(lst) * sizeof(int));
 		__assign_str(str, string);
+		__assign_str(lstr, foo);
 		__assign_vstr(vstr, fmt, va);
 		__assign_bitmask(cpus, cpumask_bits(mask), num_possible_cpus());
 		__assign_cpumask(cpum, cpumask_bits(mask));
 	),
 
-	TP_printk("foo %s %d %s %s %s %s (%s) (%s) %s", __entry->foo, __entry->bar,
+	TP_printk("foo %s %d %s %s %s %s %s (%s) (%s) %s", __entry->foo, __entry->bar,
 
 /*
  * Notice here the use of some helper functions. This includes:
@@ -359,7 +361,8 @@ TRACE_EVENT(foo_bar,
 		  __print_array(__get_dynamic_array(list),
 				__get_dynamic_array_len(list) / sizeof(int),
 				sizeof(int)),
-		  __get_str(str), __get_bitmask(cpus), __get_cpumask(cpum),
+		  __get_str(str), __get_str(lstr),
+		  __get_bitmask(cpus), __get_cpumask(cpum),
 		  __get_str(vstr))
 );