diff --git a/ChangeLog b/ChangeLog
index 775b276cc3..6995808990 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Sep 12 01:21:22 2008  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* ext/syck/node.c (syck_replace_str2): fix wrong check to free ptr.
+
 Thu Sep 11 20:18:24 2008  Masaki Suketa  <masaki.suketa@nifty.ne.jp>
 
 	* test/win32ole/test_err_in_callback.rb (teardown): get rid
diff --git a/ext/syck/node.c b/ext/syck/node.c
index 890eba9d58..fb98f655cc 100644
--- a/ext/syck/node.c
+++ b/ext/syck/node.c
@@ -128,7 +128,7 @@ syck_replace_str( SyckNode *n, char *str, enum scalar_style style )
 void
 syck_replace_str2( SyckNode *n, char *str, long len, enum scalar_style style )
 {
-    if ( n->data.str != NULL ) 
+    if ( n->data.str->ptr != NULL ) 
     {
         S_FREE( n->data.str->ptr );
         n->data.str->ptr = NULL;