diff --git a/ChangeLog b/ChangeLog
index 60402f9c47..e4a44a61ad 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Aug 26 00:02:49 2008  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* ext/bigdecimal/bigdecimal.c (VpMult): fix double free.
+
 Mon Aug 25 23:59:36 2008  Tanaka Akira  <akr@fsij.org>
 
 	* transcode.c (rb_econv_open): make last_tc NULL if there are only
diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index 213d9ea149..e8da7cc415 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -3165,7 +3165,7 @@ VpMult(Real *c, Real *a, Real *b)
 
     c->exponent = a->exponent;    /* set exponent */
     if(!AddExponent(c,b->exponent)) {
-	VpFree(c);
+	if(w) VpFree(c);
 	return 0;
     }
     VpSetSign(c,VpGetSign(a)*VpGetSign(b));    /* set sign  */