1 files changed, 5 insertions, 5 deletions

diff --git a/vm.c b/vm.c
index 8551b0dc0e..750c756808 100644
--- a/vm.c
+++ b/vm.c
@@ -231,7 +231,7 @@ vm_set_main_stack(rb_thread_t *th, VALUE iseqval)
 }
 
 rb_control_frame_t *
-rb_vm_get_binding_creatable_next_cfp(rb_thread_t *th, const rb_control_frame_t *cfp)
+rb_vm_get_binding_creatable_next_cfp(const rb_thread_t *th, const rb_control_frame_t *cfp)
 {
     while (!RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(th, cfp)) {
 	if (cfp->iseq) {
@@ -243,7 +243,7 @@ rb_vm_get_binding_creatable_next_cfp(rb_thread_t *th, const rb_control_frame_t *
 }
 
 rb_control_frame_t *
-rb_vm_get_ruby_level_next_cfp(rb_thread_t *th, const rb_control_frame_t *cfp)
+rb_vm_get_ruby_level_next_cfp(const rb_thread_t *th, const rb_control_frame_t *cfp)
 {
     while (!RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(th, cfp)) {
 	if (RUBY_VM_NORMAL_ISEQ_P(cfp->iseq)) {
@@ -255,17 +255,17 @@ rb_vm_get_ruby_level_next_cfp(rb_thread_t *th, const rb_control_frame_t *cfp)
 }
 
 static rb_control_frame_t *
-vm_get_ruby_level_caller_cfp(rb_thread_t *th, rb_control_frame_t *cfp)
+vm_get_ruby_level_caller_cfp(const rb_thread_t *th, const rb_control_frame_t *cfp)
 {
     if (RUBY_VM_NORMAL_ISEQ_P(cfp->iseq)) {
-	return cfp;
+	return (rb_control_frame_t *)cfp;
     }
 
     cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
 
     while (!RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(th, cfp)) {
 	if (RUBY_VM_NORMAL_ISEQ_P(cfp->iseq)) {
-	    return cfp;
+	    return (rb_control_frame_t *)cfp;
 	}
 
 	if ((cfp->flag & VM_FRAME_FLAG_PASSED) == 0) {