1 files changed, 1 insertions, 1 deletions
diff --git a/struct.c b/struct.c
index 78f836f8f5..f0a377c211 100644
--- a/struct.c
+++ b/struct.c
@@ -151,7 +151,7 @@ static VALUE (*const ref_func[])(VALUE) = {
 static void
 rb_struct_modify(VALUE s)
 {
-    rb_check_frozen(s);
+    if (OBJ_FROZEN(s)) rb_error_frozen("Struct");
     if (!OBJ_UNTRUSTED(s) && rb_safe_level() >= 4)
        rb_raise(rb_eSecurityError, "Insecure: can't modify Struct");
 }