diff --git a/ChangeLog b/ChangeLog
index 814cefd514..fce9bb0421 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jan 28 02:35:41 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* hash.c (rb_hash_fetch_m): add GC guard to prevent intermediate
+	  variable from GC.
+
 Fri Jan 28 01:33:51 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* test/ruby/test_process.rb (TestProcess#test_too_long_path)
diff --git a/hash.c b/hash.c
index c7ac394bcb..2e9d70dcc5 100644
--- a/hash.c
+++ b/hash.c
@@ -583,7 +583,7 @@ rb_hash_fetch_m(int argc, VALUE *argv, VALUE hash)
     if (!RHASH(hash)->ntbl || !st_lookup(RHASH(hash)->ntbl, key, &val)) {
 	if (block_given) return rb_yield(key);
 	if (argc == 1) {
-	    VALUE desc = rb_protect(rb_inspect, key, 0);
+	    volatile VALUE desc = rb_protect(rb_inspect, key, 0);
 	    if (NIL_P(desc) || RSTRING_LEN(desc) > 65) {
 		desc = rb_any_to_s(key);
 	    }