diff --git a/executer/include/uprotocol.h b/executer/include/uprotocol.h
index 6140df8b..9430d5a4 100644
--- a/executer/include/uprotocol.h
+++ b/executer/include/uprotocol.h
@@ -255,7 +255,11 @@ struct release_user_space_desc {
 struct terminate_thread_desc {
 	int pid;
 	int tid;
-	long sig;
+
+	long code; 
+	/* 32------32  31--16  15--------8  7----0
+       exit_group          exit-status  signal */
+
 	unsigned long tsk; /* struct task_struct * */
 };
 
diff --git a/executer/kernel/mcctrl/control.c b/executer/kernel/mcctrl/control.c
index ac2710f4..5f085bac 100644
--- a/executer/kernel/mcctrl/control.c
+++ b/executer/kernel/mcctrl/control.c
@@ -2509,14 +2509,14 @@ mcexec_sig_thread(ihk_os_t os, unsigned long arg, struct file *file)
 	return ret;
 }
 
-static long mcexec_terminate_thread_unsafe(ihk_os_t os, int pid, int tid, long sig, struct task_struct *tsk)
+static long mcexec_terminate_thread_unsafe(ihk_os_t os, int pid, int tid, long code, struct task_struct *tsk)
 {
 	struct ikc_scd_packet *packet;
 	struct mcctrl_usrdata *usrdata = ihk_host_os_get_usrdata(os);
 	struct mcctrl_per_proc_data *ppd;
 	struct mcctrl_per_thread_data *ptd;
 
-	dprintk("%s: target pid=%d,tid=%d,sig=%lx,task=%p\n", __FUNCTION__, pid, tid, sig, tsk);
+	dprintk("%s: target pid=%d,tid=%d,code=%lx,task=%p\n", __FUNCTION__, pid, tid, code, tsk);
 
 	ppd = mcctrl_get_per_proc_data(usrdata, pid);
 	if (!ppd) {
@@ -2542,7 +2542,7 @@ static long mcexec_terminate_thread_unsafe(ihk_os_t os, int pid, int tid, long s
 				__FUNCTION__, tid);
 		goto no_ptd;
 	}
-	__return_syscall(usrdata->os, packet, sig, tid);
+	__return_syscall(usrdata->os, packet, code, tid);
 	ihk_ikc_release_packet((struct ihk_ikc_free_packet *)packet,
 						   (usrdata->ikc2linux[smp_processor_id()] ?
 							usrdata->ikc2linux[smp_processor_id()] :
@@ -2606,7 +2606,7 @@ mcexec_terminate_thread(ihk_os_t os, struct terminate_thread_desc * __user arg)
 
 	write_unlock_irqrestore(&host_thread_lock, flags);
 
-	rc = mcexec_terminate_thread_unsafe(os, desc.pid, desc.tid, desc.sig, (struct task_struct *)desc.tsk);
+	rc = mcexec_terminate_thread_unsafe(os, desc.pid, desc.tid, desc.code, (struct task_struct *)desc.tsk);
 
  out:
 	return rc;
diff --git a/executer/user/syscall_intercept.c b/executer/user/syscall_intercept.c
index e97cdf6e..de8efad5 100644
--- a/executer/user/syscall_intercept.c
+++ b/executer/user/syscall_intercept.c
@@ -23,7 +23,7 @@ hook(long syscall_number,
 	//return 1; /* debug */
 	int tid = uti_syscall0(__NR_gettid);
 	struct terminate_thread_desc term_desc;
-	unsigned long sig;
+	unsigned long code;
 		
 	if (!uti_desc.start_syscall_intercept) {
 		return 1; /* System call isn't taken over */
@@ -79,15 +79,15 @@ hook(long syscall_number,
 		}
 		break;
 	case __NR_exit_group:
-		sig = 0x100000000;
+		code = 0x100000000;
 		goto make_remote_thread_exit;
 	case __NR_exit:
-		sig = 0;
+		code = 0;
 	make_remote_thread_exit:
 		/* Make migrated-to-Linux thread on the McKernel side call do_exit() or terminate() */
 		term_desc.pid = uti_desc.pid;
 		term_desc.tid = uti_desc.tid; /* tid of mcexec */
-		term_desc.sig = sig | (arg0 << 8);
+		term_desc.code = code | ((arg0 & 255) << 8);
 		term_desc.tsk = uti_desc.key;
 
 		uti_syscall3(__NR_ioctl, uti_desc.fd, MCEXEC_UP_TERMINATE_THREAD, (long)&term_desc);