1 files changed, 1 insertions, 0 deletions
diff --git a/rational.c b/rational.c
index 3965144b61..6e3b39639d 100644
--- a/rational.c
+++ b/rational.c
@@ -1602,6 +1602,7 @@ static VALUE
 nurat_marshal_load(VALUE self, VALUE a)
 {
     get_dat1(self);
+    Check_Type(a, T_ARRAY);
     dat->num = RARRAY_PTR(a)[0];
     dat->den = RARRAY_PTR(a)[1];
     rb_copy_generic_ivar(self, a);