diff --git a/lib/libthread_db/thread_db.h b/lib/libthread_db/thread_db.h
index 3a1fc7fec93e..3508eba35eac 100644
--- a/lib/libthread_db/thread_db.h
+++ b/lib/libthread_db/thread_db.h
@@ -184,7 +184,7 @@ typedef struct {
 	int		ti_pri;
 	lwpid_t		ti_lid;
 	char		ti_db_suspended;
-	char		ti_traceme;
+	int		ti_traceme;
 	sigset_t	ti_sigmask;
 	sigset_t	ti_pending;
 	psaddr_t	ti_tls;