diff --git a/marshal.c b/marshal.c
index 3d42c7bb2f..8eb7b07329 100644
--- a/marshal.c
+++ b/marshal.c
@@ -1837,7 +1837,8 @@ r_object0(struct load_arg *arg, int *ivp, VALUE extmod)
 
       case TYPE_USRMARSHAL:
         {
-	    VALUE klass = path2class(r_unique(arg));
+	    VALUE name = r_unique(arg);
+	    VALUE klass = path2class(name);
 	    VALUE oldclass = 0;
 	    VALUE data;
 
@@ -1847,8 +1848,8 @@ r_object0(struct load_arg *arg, int *ivp, VALUE extmod)
 		append_extmod(v, extmod);
             }
 	    if (!rb_obj_respond_to(v, s_mload, TRUE)) {
-		rb_raise(rb_eTypeError, "instance of %s needs to have method `marshal_load'",
-			 rb_class2name(klass));
+		rb_raise(rb_eTypeError, "instance of %"PRIsVALUE" needs to have method `marshal_load'",
+			 name);
 	    }
 	    v = r_entry(v, arg);
 	    data = r_object(arg);
diff --git a/test/ruby/test_marshal.rb b/test/ruby/test_marshal.rb
index 1b74b47dd1..3548850a42 100644
--- a/test/ruby/test_marshal.rb
+++ b/test/ruby/test_marshal.rb
@@ -684,4 +684,15 @@ class TestMarshal < Test::Unit::TestCase
       Marshal.load(d)
     }
   end
+
+  def test_unloadable_usrmarshal
+    c = eval("class UsrMarshal\u{23F0 23F3}<Time;self;end")
+    c.class_eval {
+      alias marshal_dump _dump
+    }
+    d = Marshal.dump(c.new)
+    assert_raise_with_message(TypeError, /UsrMarshal\u{23F0 23F3}/) {
+      Marshal.load(d)
+    }
+  end
 end