1 files changed, 1 insertions, 0 deletions
diff --git a/thread.c b/thread.c
index 7acf191ffb..3eb304d007 100644
--- a/thread.c
+++ b/thread.c
@@ -69,6 +69,7 @@ static int rb_thread_dead(rb_thread_t *th);
 
 static void rb_check_deadlock(rb_vm_t *vm);
 
+int rb_signal_buff_size(void);
 void rb_signal_exec(rb_thread_t *th, int sig);
 void rb_disable_interrupt(void);
 void rb_thread_stop_timer_thread(void);