diff --git a/executer/kernel/mcctrl/mcctrl.h b/executer/kernel/mcctrl/mcctrl.h
index 6983d440..9273597f 100644
--- a/executer/kernel/mcctrl/mcctrl.h
+++ b/executer/kernel/mcctrl/mcctrl.h
@@ -320,7 +320,7 @@ inline struct mcctrl_per_thread_data *mcctrl_get_per_thread_data(
 	struct mcctrl_per_proc_data *ppd, struct task_struct *task);
 
 void __return_syscall(ihk_os_t os, struct ikc_scd_packet *packet, 
-		int ret, int stid);
+		long ret, int stid);
 
 #define PROCFS_NAME_MAX 1000
 
diff --git a/executer/kernel/mcctrl/syscall.c b/executer/kernel/mcctrl/syscall.c
index 8bd45a71..86fb4a1f 100644
--- a/executer/kernel/mcctrl/syscall.c
+++ b/executer/kernel/mcctrl/syscall.c
@@ -1337,7 +1337,7 @@ static long pager_call(ihk_os_t os, struct syscall_request *req)
 }
 
 void __return_syscall(ihk_os_t os, struct ikc_scd_packet *packet,
-		int ret, int stid)
+		long ret, int stid)
 {
 	unsigned long phys;
 	struct syscall_response *res;