diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index be8412d..de3fc8b 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -2950,7 +2950,7 @@
 	return 0;
 }
 
-int parse_event_file(char *buf, unsigned long size, char *system__unused __unused)
+int parse_event_file(char *buf, unsigned long size, char *sys)
 {
 	struct event *event;
 	int ret;
@@ -2977,6 +2977,8 @@
 	if (ret < 0)
 		die("failed to read event print fmt");
 
+	event->system = strdup(sys);
+
 #define PRINT_ARGS 0
 	if (PRINT_ARGS && event->print_fmt.args)
 		print_args(event->print_fmt.args);
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 00b440d..cb92978 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -133,6 +133,7 @@
 	int			flags;
 	struct format		format;
 	struct print_fmt	print_fmt;
+	char			*system;
 };
 
 enum {
@@ -167,7 +168,7 @@
 void print_printk(void);
 
 int parse_ftrace_file(char *buf, unsigned long size);
-int parse_event_file(char *buf, unsigned long size, char *system);
+int parse_event_file(char *buf, unsigned long size, char *sys);
 void print_event(int cpu, void *data, int size, unsigned long long nsecs,
 		  char *comm);