diff --git a/config.json b/config.json
index 6ce9c99..6c3ea80 100644
--- a/config.json
+++ b/config.json
@@ -12,7 +12,7 @@
     },
     "nvim": {
       "link": { "from": "shared/nvim", "to": "~/.config/nvim/init.lua" },
-      "post-link": "echo 'alias vim=nvim' >> ~/.zshrc"
+      "post-link": "(grep -q 'alias vim=nvim' ~/.zshrc || echo 'alias vim=nvim' >> ~/.zshrc) || true"
     },
     "zsh": {
       "link": { "from": "shared/zsh", "to": "~/.zshrc" }
@@ -91,7 +91,7 @@
         "package": "nvim",
 	"ignore-template": true,
         "link": { "from": "linux-dev/nvim", "to": "~/.config/nvim" },
-        "post-link": "nvim --headless '+Lazy! restore' '+MasonUpdate' +qa && echo 'alias vim=nvim' >> ~/.zshrc"
+        "post-link": "nvim --headless '+Lazy! restore' '+MasonUpdate' +qa && (grep -q 'alias vim=nvim' ~/.zshrc || echo 'alias vim=nvim' >> ~/.zshrc) || true"
       },
       {
         "package": "git",