diff --git a/ChangeLog b/ChangeLog
index 5049145058..08c6ed01c1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Mon Sep  8 18:13:13 2008  Tanaka Akira  <akr@fsij.org>
+
+	* vm.c (rb_mRubyVMFrozenCore): registered for GC.
+
+	* re.c (rb_reg_preprocess_dregexp): fix GC problem on MacOS X with
+	  powerpc-apple-darwin8-gcc-4.0.1 (GCC) 4.0.1 (Apple Computer, Inc.
+	  build 5367).
+
 Mon Sep  8 18:09:07 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/Makefile.sub (config.h): define SIZE_MAX for VC++6/7.
diff --git a/re.c b/re.c
index de7ebeb41b..a17874ab71 100644
--- a/re.c
+++ b/re.c
@@ -2249,15 +2249,13 @@ rb_reg_preprocess_dregexp(VALUE ary)
     onig_errmsg_buffer err = "";
     int i;
     VALUE result = 0;
-    int argc = RARRAY_LEN(ary);
-    VALUE *argv = RARRAY_PTR(ary);
 
-    if (argc == 0) {
+    if (RARRAY_LEN(ary) == 0) {
         rb_raise(rb_eArgError, "no arguments given");
     }
 
-    for (i = 0; i < argc; i++) {
-        VALUE str = argv[i];
+    for (i = 0; i < RARRAY_LEN(ary); i++) {
+        VALUE str = RARRAY_PTR(ary)[i];
         VALUE buf;
         char *p, *end;
         rb_encoding *src_enc;
diff --git a/vm.c b/vm.c
index b39db29de9..71658195b1 100644
--- a/vm.c
+++ b/vm.c
@@ -1820,6 +1820,7 @@ Init_VM(void)
     rb_define_method_id(klass, id_core_define_singleton_method, m_core_define_singleton_method, 3);
     rb_define_method_id(klass, id_core_set_postexe, m_core_set_postexe, 1);
     rb_obj_freeze(fcore);
+    rb_global_variable(&rb_mRubyVMFrozenCore);
     rb_mRubyVMFrozenCore = fcore;
 
     /* ::VM::Env */