diff -rupN ruby-1.8.7-p374.orig/marshal.c ruby-1.8.7-p374/marshal.c

--- ruby-1.8.7-p374.orig/marshal.c	2012-03-01 18:45:35.000000000 -0800

+++ ruby-1.8.7-p374/marshal.c	2013-08-10 16:45:24.260126000 -0700

@@ -756,7 +756,7 @@ marshal_dump(argc, argv)

     VALUE obj, port, a1, a2;

     int limit = -1;

     struct dump_arg *arg;

-    VALUE wrapper;

+    volatile VALUE wrapper;

     port = Qnil;

     rb_scan_args(argc, argv, "12", &obj, &a1, &a2);

@@ -1450,7 +1450,8 @@ marshal_load(argc, argv)

 {

     VALUE port, proc;

     int major, minor, taint = Qfalse;

-    VALUE v, wrapper;

+    VALUE v;

+    volatile VALUE wrapper;

     struct load_arg *arg;

     rb_scan_args(argc, argv, "11", &port, &proc);