diff --git a/ChangeLog b/ChangeLog
index 2e30630260..5aecf003a2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Apr  1 05:32:17 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* string.c (rb_str_inspect): wrong result of UTF-8 inspect because of
+	  the mistake of calculation.  reported by eban via IRC.
+
 Sun Jan 10 19:00:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/webrick/accesslog.rb : Escape needed.
diff --git a/string.c b/string.c
index 69430c6cfc..c6b2301874 100644
--- a/string.c
+++ b/string.c
@@ -2642,7 +2642,7 @@ rb_str_inspect(str)
     while (p < pend) {
 	char c = *p++;
 	int len;
-	if (ismbchar(c) && p + (len = mbclen(c)) <= pend) {
+	if (ismbchar(c) && p - 1 + (len = mbclen(c)) <= pend) {
 	    rb_str_buf_cat(result, p - 1, len);
 	    p += len - 1;
 	}
diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index cb1bd575e5..5f2c54f44a 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -24,7 +24,7 @@ class TestString < Test::Unit::TestCase
     assert_equal('"\343\201\202"', "\xe3\x81\x82".inspect)
 
     $KCODE = 'u'
-    assert_equal('"\\343\\201\\202"', "\xe3\x81\x82".inspect)
+    assert_equal("\"\343\201\202\"", "\xe3\x81\x82".inspect)
     assert_no_match(/\0/, "\xe3\x81".inspect, '[ruby-dev:39550]')
   ensure
     $KCODE = original_kcode
diff --git a/version.h b/version.h
index e2c372c202..fb30f9b5a0 100644
--- a/version.h
+++ b/version.h
@@ -1,15 +1,15 @@
 #define RUBY_VERSION "1.8.7"
-#define RUBY_RELEASE_DATE "2010-01-10"
+#define RUBY_RELEASE_DATE "2010-04-01"
 #define RUBY_VERSION_CODE 187
-#define RUBY_RELEASE_CODE 20100110
-#define RUBY_PATCHLEVEL 249
+#define RUBY_RELEASE_CODE 20100401
+#define RUBY_PATCHLEVEL 250
 
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 8
 #define RUBY_VERSION_TEENY 7
 #define RUBY_RELEASE_YEAR 2010
-#define RUBY_RELEASE_MONTH 1
-#define RUBY_RELEASE_DAY 10
+#define RUBY_RELEASE_MONTH 4
+#define RUBY_RELEASE_DAY 1
 
 #ifdef RUBY_EXTERN
 RUBY_EXTERN const char ruby_version[];