diff --git a/reinstall.sh b/reinstall.sh
index d9f2fed..11c737e 100644
--- a/reinstall.sh
+++ b/reinstall.sh
@@ -1665,7 +1665,9 @@ Continue?
         if is_in_china; then
             mirror=https://mirror.nju.edu.cn/nix-channels
         else
-            mirror=https://nixos.org/channels
+            # https://nixos.org/channels 没有 ipv6
+            # 且跳转到 https://channels.nixos.org
+            mirror=https://channels.nixos.org
         fi
 
         if is_use_cloud_image; then
diff --git a/trans.sh b/trans.sh
index e8a66de..0da722b 100644
--- a/trans.sh
+++ b/trans.sh
@@ -1802,7 +1802,8 @@ install_nixos() {
     ram_per_thread=2048
 
     threads=$(get_build_threads $ram_per_thread)
-    swap_size=$(get_need_swap_size $ram_per_thread)
+    # 最少需要的总内存 = 1 个编译线程所需的内存 + Alpine Live OS 所需的内存 (512M)
+    swap_size=$(get_need_swap_size $((ram_per_thread + 512)))
 
     show_nixos_config() {
         echo