1 files changed, 2 insertions, 2 deletions
diff --git a/vm_core.h b/vm_core.h
index 9ab23b2087..93163098e2 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -988,8 +988,8 @@ rb_vm_living_threads_remove(rb_vm_t *vm, rb_thread_t *th)
 
 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);
-rb_control_frame_t *rb_vm_get_binding_creatable_next_cfp(rb_thread_t *th, const rb_control_frame_t *cfp);
+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);
 int rb_vm_get_sourceline(const rb_control_frame_t *);
 VALUE rb_name_err_mesg_new(VALUE obj, VALUE mesg, VALUE recv, VALUE method);
 void rb_vm_stack_to_heap(rb_thread_t *th);