diff --git a/ChangeLog b/ChangeLog
index 2e3992d7f2..7e109e70c0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Tue Dec 13 01:44:16 2005  Tanaka Akira  <akr@m17n.org>
+
+	* array.c (rb_ary_diff): fix a GC problem on IA64 with
+	  gcc 3.3.5 (Debian 1:3.3.5-13).
+	  When rb_ary_push is called, there was no register
+	  which contains
+	  `hash' but `&RHASH(hash)->tbl' instead.
+
 Tue Dec 13 00:08:09 2005  Tanaka Akira  <akr@m17n.org>
 
 	* sprintf.c (rb_str_format): fix a GC problem.
diff --git a/array.c b/array.c
index 68cbb6bfe3..f79a79c784 100644
--- a/array.c
+++ b/array.c
@@ -2510,7 +2510,8 @@ ary_make_hash(VALUE ary1, VALUE ary2)
 static VALUE
 rb_ary_diff(VALUE ary1, VALUE ary2)
 {
-    VALUE ary3, hash;
+    VALUE ary3;
+    volatile VALUE hash;
     long i;
 
     hash = ary_make_hash(to_ary(ary2), 0);