1 files changed, 4 insertions, 0 deletions
diff --git a/rational.c b/rational.c
index 8d0e8306f5..c4469c8092 100644
--- a/rational.c
+++ b/rational.c
@@ -1605,6 +1605,10 @@ static VALUE
 nurat_marshal_load(VALUE self, VALUE a)
 {
     get_dat1(self);
+
+    rb_check_frozen(self);
+    rb_check_trusted(self);
+
     Check_Type(a, T_ARRAY);
     if (RARRAY_LEN(a) != 2)
 	rb_raise(rb_eArgError, "marshaled rational must have an array whose length is 2 but %ld", RARRAY_LEN(a));