diff --git a/ChangeLog b/ChangeLog
index a31031560f..89b3995144 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Aug 16 09:47:29 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* vm_dump.c (bugreport_backtrace): rb_backtrace_iter_func now
+	  takes VALUE as file and method names.
+
 Sun Aug 16 03:06:59 2009  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_insnhelper.c (opt_eq_func): fix optimization bug.  This issue
diff --git a/vm_dump.c b/vm_dump.c
index d22c652cf0..0759a93fe3 100644
--- a/vm_dump.c
+++ b/vm_dump.c
@@ -565,14 +565,14 @@ rb_vmdebug_thread_dump_state(VALUE self)
 }
 
 static int
-bugreport_backtrace(void *arg, const char *file, int line, const char *method)
+bugreport_backtrace(void *arg, VALUE file, int line, VALUE method)
 {
     if (!*(int *)arg) {
 	fprintf(stderr, "-- Ruby level backtrace information"
 		"-----------------------------------------\n");
 	*(int *)arg = 1;
     }
-    fprintf(stderr, "%s:%d:in `%s'\n", file, line, method);
+    fprintf(stderr, "%s:%d:in `%s'\n", RSTRING_PTR(file), line, RSTRING_PTR(method));
     return 0;
 }