diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index 436cb5f9d751..c246f0290623 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -55,14 +55,8 @@ static bool		tasks_only;
 static bool		with_backtrace;
 
 
-struct per_pid;
 struct per_pidcomm;
-
 struct cpu_sample;
-struct power_event;
-struct wake_event;
-
-struct sample_wrapper;
 
 /*
  * Datastructure layout:
@@ -155,7 +149,6 @@ struct wake_event {
 static struct power_event    *power_events;
 static struct wake_event     *wake_events;
 
-struct process_filter;
 struct process_filter {
 	char			*name;
 	int			pid;