diff --git a/dist/index.js b/dist/index.js
index 5072918..37902ae 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -489,7 +489,7 @@ class NixInstallerAction {
     }
     async setup_kvm() {
         const current_user = (0,node_os__WEBPACK_IMPORTED_MODULE_8__.userInfo)();
-        const is_root = current_user.username === "root";
+        const is_root = current_user.uid === 0;
         const maybe_sudo = is_root ? "sudo" : "";
         const kvm_rules = "/etc/udev/rules.d/99-determinate-nix-installer-kvm.rules";
         try {
diff --git a/src/main.ts b/src/main.ts
index 358134b..443b6d6 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -631,7 +631,7 @@ class NixInstallerAction {
 
   private async setup_kvm(): Promise<boolean> {
     const current_user = userInfo();
-    const is_root = current_user.username === "root";
+    const is_root = current_user.uid === 0;
     const maybe_sudo = is_root ? "sudo" : "";
 
     const kvm_rules =