diff --git a/userprog/syscall.c b/userprog/syscall.c
index 36285fa804bdc8218b41a750b0a253f6f2d96eab..39901d9ae563aac02ed7082a598f655eee82cc33 100644
--- a/userprog/syscall.c
+++ b/userprog/syscall.c
@@ -74,6 +74,9 @@ syscall_handler (struct intr_frame *f UNUSED)
   case SYSCALL_WRITE:
     syscall_write(f);
     break;
+  case SYSCALL_OPEN:
+    syscall_open(f);
+	break;
   default:
     printf ("WARNING: Invalid Syscall (%d)\n", syscall_number);
     thread_exit ();