diff --git a/ChangeLog b/ChangeLog
index ea7d882ffd..697dcd262e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Jan  9 13:03:34 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* string.c (rb_enc_cr_str_buf_cat): do not recalculate coderange
+	  value if it's given from outside.
+
 Wed Jan  9 08:42:01 2008  James Edward Gray II  <jeg2@ruby-lang.org>
 
 	* enum.c:  Updating the documentation of Enumrable#zip to reflect
diff --git a/string.c b/string.c
index d72d0352c7..57b5cd837b 100644
--- a/string.c
+++ b/string.c
@@ -1076,12 +1076,14 @@ rb_enc_cr_str_buf_cat(VALUE str, const char *ptr, long len,
             (ptr_a8 && str_cr != ENC_CODERANGE_7BIT)) {
             ptr_cr = ENC_CODERANGE_UNKNOWN;
         }
-        else {
+        else if (ptr_cr == ENC_CODERANGE_UNKNOWN) {
             ptr_cr = coderange_scan(ptr, len, rb_enc_from_index(ptr_encindex));
         }
     }
     else {
-        ptr_cr = coderange_scan(ptr, len, rb_enc_from_index(ptr_encindex));
+	if (ptr_cr == ENC_CODERANGE_UNKNOWN) {
+	    ptr_cr = coderange_scan(ptr, len, rb_enc_from_index(ptr_encindex));
+	}
         if (str_cr == ENC_CODERANGE_UNKNOWN) {
             if (str_a8 || ptr_cr != ENC_CODERANGE_7BIT) {
                 str_cr = rb_enc_str_coderange(str);
diff --git a/version.h b/version.h
index 251ef29a5c..90b95c846d 100644
--- a/version.h
+++ b/version.h
@@ -1,7 +1,7 @@
 #define RUBY_VERSION "1.9.0"
-#define RUBY_RELEASE_DATE "2008-01-08"
+#define RUBY_RELEASE_DATE "2008-01-09"
 #define RUBY_VERSION_CODE 190
-#define RUBY_RELEASE_CODE 20080108
+#define RUBY_RELEASE_CODE 20080109
 #define RUBY_PATCHLEVEL 0
 
 #define RUBY_VERSION_MAJOR 1
@@ -9,7 +9,7 @@
 #define RUBY_VERSION_TEENY 0
 #define RUBY_RELEASE_YEAR 2008
 #define RUBY_RELEASE_MONTH 1
-#define RUBY_RELEASE_DAY 8
+#define RUBY_RELEASE_DAY 9
 
 #ifdef RUBY_EXTERN
 RUBY_EXTERN const char ruby_version[];