diff --git a/src/userprog/syscall.c b/src/userprog/syscall.c
index 1d3ef62..5fec7d3 100644
--- a/src/userprog/syscall.c
+++ b/src/userprog/syscall.c
@@ -14,6 +14,7 @@ typedef uintptr_t syscall_function (uintptr_t, uintptr_t, uintptr_t);
 
 /* System Call Functions */
 static void halt (void);
+static void exit (int status);
 
 void
 syscall_init (void) 
@@ -33,3 +34,9 @@ halt (void)
 {
   shutdown_power_off ();
 }
+
+static void
+exit (int status)
+{
+  //TODO
+}
\ No newline at end of file