diff --git a/ChangeLog b/ChangeLog
index 98a3a7e1cf..544df309c9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jul  8 21:59:34 2013  Tanaka Akira  <akr@fsij.org>
+
+	* bignum.c (bary_mul_balance): Initialize a local variable to suppress
+	  a warning.
+
 Mon Jul  8 20:55:22 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (bary_mul_balance): Reduce work memory.
diff --git a/bignum.c b/bignum.c
index aeefa21e3a..eed2181955 100644
--- a/bignum.c
+++ b/bignum.c
@@ -1542,7 +1542,7 @@ static void
 bary_mul_balance(BDIGIT *zds, size_t zl, BDIGIT *xds, size_t xl, BDIGIT *yds, size_t yl)
 {
     VALUE work = 0;
-    BDIGIT *wds;
+    BDIGIT *wds = NULL;
     size_t yl0 = yl;
     size_t r, n;
     size_t wl = 0;