diff --git a/ChangeLog b/ChangeLog
index dc2c953990..7bdf9eee63 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Oct  9 21:17:50 2008  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* ext/syck/syck.c (syck_lookup_sym): remove reading uninitialized
+	  variable.
+
 Thu Oct  9 16:34:15 2008  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* ext/json/ext/generator/extconf.rb: fix target.
diff --git a/ext/syck/syck.c b/ext/syck/syck.c
index 92b7566d1a..e0fc2bc244 100644
--- a/ext/syck/syck.c
+++ b/ext/syck/syck.c
@@ -192,11 +192,11 @@ syck_add_sym( SyckParser *p, void *data )
 int
 syck_lookup_sym( SyckParser *p, SYMID id, void **datap )
 {
-    st_data_t data = (st_data_t)*datap;
+    st_data_t data;
     int ret;
     if ( p->syms == NULL ) return 0;
     ret = st_lookup( p->syms, id, &data );
-    *datap = (void *)data;
+    if(ret) *datap = (void *)data;
     return ret;
 }