1 files changed, 0 insertions, 1 deletions
diff --git a/vm_core.h b/vm_core.h
index aacdd3b897..da1455266d 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -1036,7 +1036,6 @@ rb_vm_living_threads_remove(rb_vm_t *vm, rb_thread_t *th)
     vm->living_thread_num--;
 }
 
-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(const rb_thread_t *th, const rb_control_frame_t *cfp);
 rb_control_frame_t *rb_vm_get_binding_creatable_next_cfp(const rb_thread_t *th, const rb_control_frame_t *cfp);