diff --git a/ChangeLog b/ChangeLog
index e276511673..79d344efbc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Nov  1 01:51:01 2007  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* vm_core.h (ruby_current_thread): RUBY_EXTERN'ed for probeprofiler.
+
 Thu Nov  1 00:46:30 2007  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/configure.bat, setup.mak: now can recognize OS even if
diff --git a/vm_core.h b/vm_core.h
index 69e9e1cd06..56879760fc 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -633,7 +633,7 @@ RUBY_EXTERN VALUE sysstack_error;
 /* for thread */
 
 #if RUBY_VM_THREAD_MODEL == 2
-extern rb_thread_t *ruby_current_thread;
+RUBY_EXTERN rb_thread_t *ruby_current_thread;
 extern rb_vm_t *ruby_current_vm;
 
 #define GET_VM() ruby_current_vm