diff --git a/ChangeLog b/ChangeLog
index 2144d209a3..ca71e9370e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Oct 16 06:44:06 2012  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_insnhelper.c (VM_CALLEE_SETUP_ARG): fix wrong condition.
+
 Tue Oct 16 06:29:18 2012  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_insnhelper.c (vm_call_method): disable CI_SET_FASTPATH() if
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 239f67f3dd..4b41af6e73 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -1183,7 +1183,7 @@ static VALUE vm_call_iseq_setup_2(rb_thread_t *th, rb_control_frame_t *cfp, rb_c
 	    argument_error((iseq), ((ci)->argc), (iseq)->argc, (iseq)->argc); \
 	} \
 	(ci)->opt_pc = 0; \
-	CI_SET_FASTPATH((ci), vm_call_iseq_setup_2, !(is_lambda) && ((ci)->me->flag & NOEX_PROTECTED)); \
+	CI_SET_FASTPATH((ci), vm_call_iseq_setup_2, !(is_lambda) && !((ci)->me->flag & NOEX_PROTECTED)); \
     } \
     else { \
 	(ci)->opt_pc = vm_callee_setup_arg_complex((th), (ci), (iseq), (argv)); \