diff --git a/ChangeLog b/ChangeLog
index 856a23102c..d26a077c5a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Dec 21 08:56:34 2012  Masaya Tarui  <tarui@ruby-lang.org>
+
+	* vm_trace.c (rb_suppress_tracing): remove unused variable 'vm_tracing'
+
 Fri Dec 21 01:01:45 2012  Masaya Tarui  <tarui@ruby-lang.org>
 
 	* lib/irb/completion.rb (CompletionProc): support completion of
diff --git a/vm_trace.c b/vm_trace.c
index f8fc829fc4..9a1fd690b2 100644
--- a/vm_trace.c
+++ b/vm_trace.c
@@ -330,7 +330,6 @@ rb_suppress_tracing(VALUE (*func)(VALUE), VALUE arg)
     VALUE result = Qnil;
     rb_thread_t *th = GET_THREAD();
     int state;
-    const int vm_tracing = th->vm->trace_running;
     const int tracing = th->trace_running;
 
     if(!tracing)