diff --git a/ChangeLog b/ChangeLog
index abd1eb324c..8406e97acf 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Jan 26 22:28:49 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
+
+	* vm_eval.c (rb_throw_obj): add GC guard to prevent intermediate
+	  variable from GC. [Bug #4322] [ruby-dev:43108]
+
 Wed Jan 26 17:08:59 2011  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
 
 	* ext/openssl/ossl_asn1.c (ossl_asn1_decode0): OpenSSL::ASN1.decode
diff --git a/vm_eval.c b/vm_eval.c
index c67e54c5e0..0dcbafad21 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -1438,6 +1438,7 @@ rb_throw_obj(VALUE tag, VALUE value)
     }
     if (!tt) {
 	VALUE desc = rb_inspect(tag);
+	RB_GC_GUARD(desc);
 	rb_raise(rb_eArgError, "uncaught throw %s", RSTRING_PTR(desc));
     }
     rb_trap_restore_mask();