diff --git a/ChangeLog b/ChangeLog
index 29bc9ca545..34dfdb2b89 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Jul 15 04:42:20 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* bignum.c (get2comp): do nothing for empty Bignum.  [ruby-dev:31225]
+
 Sat Jul 14 22:49:30 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* numeric.c (fix_pow): integer power calculation: 0**n => 0, 
diff --git a/bignum.c b/bignum.c
index d7ba14174c..51a5a43d85 100644
--- a/bignum.c
+++ b/bignum.c
@@ -70,6 +70,7 @@ get2comp(VALUE x)
     BDIGIT *ds = BDIGITS(x);
     BDIGIT_DBL num;
 
+    if (!i) return;
     while (i--) ds[i] = ~ds[i];
     i = 0; num = 1;
     do {
diff --git a/version.h b/version.h
index a6b68f57e1..84ed29ff43 100644
--- a/version.h
+++ b/version.h
@@ -1,7 +1,7 @@
 #define RUBY_VERSION "1.9.0"
-#define RUBY_RELEASE_DATE "2007-07-14"
+#define RUBY_RELEASE_DATE "2007-07-15"
 #define RUBY_VERSION_CODE 190
-#define RUBY_RELEASE_CODE 20070714
+#define RUBY_RELEASE_CODE 20070715
 #define RUBY_PATCHLEVEL 0
 
 #define RUBY_VERSION_MAJOR 1
@@ -9,7 +9,7 @@
 #define RUBY_VERSION_TEENY 0
 #define RUBY_RELEASE_YEAR 2007
 #define RUBY_RELEASE_MONTH 7
-#define RUBY_RELEASE_DAY 14
+#define RUBY_RELEASE_DAY 15
 
 #ifdef RUBY_EXTERN
 RUBY_EXTERN const char ruby_version[];