diff --git a/tools/perf/util/debug.h b/tools/perf/util/debug.h
index 5cb0a1b..047ac33 100644
--- a/tools/perf/util/debug.h
+++ b/tools/perf/util/debug.h
@@ -2,10 +2,11 @@
 #ifndef __PERF_DEBUG_H
 #define __PERF_DEBUG_H
 
+#include <stdbool.h>
 #include "event.h"
 
 extern int verbose;
-extern int dump_trace;
+extern bool dump_trace;
 
 int dump_printf(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
 void trace_event(event_t *event);