diff --git a/ChangeLog b/ChangeLog
index 5a9e0077e9..12c857a2f1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Tue Mar 16 17:33:30 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* ext/bigdecimal/bigdecimal.c (VpCtoV): keep e's sign.
+	  When e doesn't over flow e * BASE_FIG but overflow e * 10,
+	  e will overflow.
+
 Tue Mar 16 17:18:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/encoding.h (rb_str_conv_enc_opts): missing prototype.
diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index 667f58128d..189a6c77fb 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -4045,6 +4045,7 @@ VpCtoV(Real *a, const char *int_chr, U_LONG ni, const char *frac, U_LONG nf, con
             e = e * 10 + exp_chr[i] - '0';
             if(es>e*((S_INT)BASE_FIG)) {
 		exponent_overflow = 1;
+		e = es;
 		break;
             }
             ++i;