diff --git a/executer/kernel/mcctrl/syscall.c b/executer/kernel/mcctrl/syscall.c
index 57eac652..111cbc49 100644
--- a/executer/kernel/mcctrl/syscall.c
+++ b/executer/kernel/mcctrl/syscall.c
@@ -366,6 +366,7 @@ retry_alloc:
 
 #define STATUS_IN_PROGRESS	0
 #define	STATUS_SYSCALL		4
+#define __NR_syscall_response 8001
 	req->valid = 0;
 
 	if (__notify_syscall_requester(usrdata->os, packet, resp) < 0) {
@@ -440,7 +441,7 @@ retry_alloc:
 	req->valid = 0;
 
 	/* check result */
-	if (req->number != __NR_mmap) {
+	if (req->number != __NR_syscall_response) {
 		printk("%s:unexpected response. %lx %lx\n",
 		       __FUNCTION__, req->number, req->args[0]);
 		syscall_ret = -EIO;
diff --git a/kernel/syscall.c b/kernel/syscall.c
index 5e60aa5c..688ec32c 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -244,6 +244,7 @@ long do_syscall(struct syscall_request *req, int cpu)
 #define	STATUS_COMPLETED	1
 #define	STATUS_PAGE_FAULT	3
 #define	STATUS_SYSCALL		4
+#define __NR_syscall_response 8001
 	while (smp_load_acquire(&res.status) != STATUS_COMPLETED) {
 		while (smp_load_acquire(&res.status) == STATUS_IN_PROGRESS) {
 			struct cpu_local_var *v;
@@ -372,7 +373,7 @@ long do_syscall(struct syscall_request *req, int cpu)
 			}
 
 			/* send result */
-			req2.number = __NR_mmap;
+			req2.number = __NR_syscall_response;
 			req2.args[1] = syscall_ret;
 			/* The current thread is the requester and only the waiting thread
 			 * may serve the request */