diff --git a/ChangeLog b/ChangeLog
index c5dcaac01f..36340d2c72 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,6 @@
-Tue Dec  4 16:23:23 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Tue Dec  4 16:23:32 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* marshal.c (path2class, path2module): use PRIsVALUE.
 
 	* marshal.c (w_object, marshal_dump, marshal_load): use
 	  rb_check_funcall if possible.
diff --git a/marshal.c b/marshal.c
index 588b3deed2..061a8d5f31 100644
--- a/marshal.c
+++ b/marshal.c
@@ -1381,8 +1381,7 @@ path2class(VALUE path)
     VALUE v = rb_path_to_class(path);
 
     if (!RB_TYPE_P(v, T_CLASS)) {
-	rb_raise(rb_eArgError, "%.*s does not refer to class",
-		 (int)RSTRING_LEN(path), RSTRING_PTR(path));
+	rb_raise(rb_eArgError, "%"PRIsVALUE" does not refer to class", path);
     }
     return v;
 }
@@ -1393,8 +1392,7 @@ path2module(VALUE path)
     VALUE v = rb_path_to_class(path);
 
     if (!RB_TYPE_P(v, T_MODULE)) {
-	rb_raise(rb_eArgError, "%.*s does not refer to module",
-		 (int)RSTRING_LEN(path), RSTRING_PTR(path));
+	rb_raise(rb_eArgError, "%"PRIsVALUE" does not refer to module", path);
     }
     return v;
 }