diff --git a/ChangeLog b/ChangeLog
index 0425e0a6d8..02a0833f61 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Dec 20 01:46:48 2005  Tanaka Akira  <akr@m17n.org>
+
+	* io.c (rb_f_backquote): fix a GC problem on
+	  IA64 with gcc 4.0.3 20051216 (prerelease) -O3.
+
 Mon Dec 19 23:32:39 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (rb_symname_p): fixed wrong validation.  [ruby-dev:28047]
diff --git a/io.c b/io.c
index 826285842c..626e9b8c62 100644
--- a/io.c
+++ b/io.c
@@ -4513,7 +4513,8 @@ static VALUE
 rb_f_backquote(obj, str)
     VALUE obj, str;
 {
-    VALUE port, result;
+    volatile VALUE port;
+    VALUE result;
     OpenFile *fptr;
 
     SafeStringValue(str);