1 files changed, 0 insertions, 1 deletions
diff --git a/vm_core.h b/vm_core.h
index 0883f66ed5..dfce1785ac 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -886,7 +886,6 @@ rb_vm_living_threads_remove(rb_vm_t *vm, rb_thread_t *th)
     vm->living_thread_num--;
 }
 
-void rb_vm_living_threads_foreach(rb_vm_t*, int (*)(rb_thread_t*, void*), void*);
 int ruby_thread_has_gvl_p(void);
 typedef int rb_backtrace_iter_func(void *, VALUE, int, VALUE);
 rb_control_frame_t *rb_vm_get_ruby_level_next_cfp(rb_thread_t *th, const rb_control_frame_t *cfp);