diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 05f0391..e89b815 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8028,8 +8028,13 @@
             }
         }
         return ret;
-#ifdef TARGET_NR_umount
+#if defined(TARGET_NR_umount) || defined(TARGET_NR_oldumount)
+#if defined(TARGET_NR_umount)
     case TARGET_NR_umount:
+#endif
+#if defined(TARGET_NR_oldumount)
+    case TARGET_NR_oldumount:
+#endif
         if (!(p = lock_user_string(arg1)))
             return -TARGET_EFAULT;
         ret = get_errno(umount(p));