1 files changed, 1 insertions, 1 deletions
diff --git a/method.h b/method.h
index 21a02bc7d0..d36cf38297 100644
--- a/method.h
+++ b/method.h
@@ -42,7 +42,7 @@ typedef struct rb_cref_struct {
     const VALUE refinements;
     const VALUE klass;
     struct rb_cref_struct * const next;
-    rb_scope_visibility_t scope_visi;
+    const rb_scope_visibility_t scope_visi;
 } rb_cref_t;
 
 /* method data type */