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);