diff --git a/ChangeLog b/ChangeLog
index bd4126a528..291d8fcf78 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -16,6 +16,11 @@ Sun Oct 21 18:29:17 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* encoding.c (set_primary_encoding): removed primary_encoding setter.
 
+Sat Oct 20 13:17:01 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* enum.c (enum_cycle): hide temporary array from ObjectSpace.
+	  [ruby-core:12762]
+
 Sat Oct 20 11:49:20 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* file.c (rb_get_path): returns frozen string.
diff --git a/enum.c b/enum.c
index 0a64b5740d..82a64fe0a3 100644
--- a/enum.c
+++ b/enum.c
@@ -1541,17 +1541,20 @@ static VALUE
 enum_cycle(VALUE obj)
 {
     VALUE ary;
-    long i;
+    long i, len;
 
     RETURN_ENUMERATOR(obj, 0, 0);
     ary = rb_ary_new();
+    RBASIC(ary)->klass = 0;
     rb_block_call(obj, id_each, 0, 0, cycle_i, ary);
-    while (RARRAY_LEN(ary) > 0) {
-	for (i=0; i<RARRAY_LEN(ary); i++) {
+    len = RARRAY_LEN(ary);
+    if (len == 0) return Qnil;
+    for (;;) {
+	for (i=0; i<len; i++) {
 	    rb_yield(RARRAY_PTR(ary)[i]);
 	}
     }
-    return Qnil;
+    return Qnil;		/* not reached */
 }
 
 /*
diff --git a/version.h b/version.h
index 462962f15b..3843b67e39 100644
--- a/version.h
+++ b/version.h
@@ -1,7 +1,7 @@
 #define RUBY_VERSION "1.9.0"
-#define RUBY_RELEASE_DATE "2007-10-22"
+#define RUBY_RELEASE_DATE "2007-10-23"
 #define RUBY_VERSION_CODE 190
-#define RUBY_RELEASE_CODE 20071022
+#define RUBY_RELEASE_CODE 20071023
 #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 10
-#define RUBY_RELEASE_DAY 22
+#define RUBY_RELEASE_DAY 23
 
 #ifdef RUBY_EXTERN
 RUBY_EXTERN const char ruby_version[];