1 files changed, 2 insertions, 2 deletions
diff --git a/struct.c b/struct.c
index 415032bed4..eecc47254e 100644
--- a/struct.c
+++ b/struct.c
@@ -223,7 +223,7 @@ rb_struct_alloc_noinit(VALUE klass)
 }
 
 VALUE
-rb_struct_define_without_accessor(char *class_name, VALUE super, rb_alloc_func_t alloc, ...)
+rb_struct_define_without_accessor(const char *class_name, VALUE super, rb_alloc_func_t alloc, ...)
 {
     VALUE klass;
     va_list ar;
@@ -479,7 +479,7 @@ rb_struct_each_pair(VALUE s)
 static VALUE
 inspect_struct(VALUE s, VALUE dummy, int recur)
 {
-    char *cname = rb_class2name(rb_obj_class(s));
+    const char *cname = rb_class2name(rb_obj_class(s));
     VALUE str, members;
     long i;