diff --git a/oxlint-plugin-t3code/test/utils.ts b/oxlint-plugin-t3code/test/utils.ts
index eb91d32d7d4..740da8a4f2b 100644
--- a/oxlint-plugin-t3code/test/utils.ts
+++ b/oxlint-plugin-t3code/test/utils.ts
@@ -9,6 +9,17 @@ import * as Predicate from "effect/Predicate";
 import * as Schema from "effect/Schema";
 import * as Stream from "effect/Stream";
 import { ChildProcess, ChildProcessSpawner } from "effect/unstable/process";
+import * as NodeModule from "node:module";
+
+// oxlint is only a transitive dependency (via vite-plus), so its bin placement
+// varies by package manager: pnpm hoists it into the virtual store, while
+// other layouts expose vite-plus's LSP-only wrapper instead. Resolve the real
+// package through vite-plus rather than hardcoding either layout, and do it at
+// module scope so a broken install fails once with a resolution error instead
+// of as an opaque defect in every test.
+const oxlintPackageJsonPath = NodeModule.createRequire(
+  NodeModule.createRequire(import.meta.url).resolve("vite-plus/package.json"),
+).resolve("oxlint/package.json");
 
 class OxlintFixtureFailure extends Data.TaggedError("OxlintFixtureFailure")<{
   readonly exitCode: number;
@@ -93,14 +104,7 @@ export const createOxlintRuleHarness = (
     const configPath = path.join(fixtureDir, ".oxlintrc.json");
     const sourcePath = path.join(fixtureDir, options.filename ?? "fixture.ts");
     const repoRoot = path.join(import.meta.dirname, "..", "..");
-    const oxlintBin = path.join(
-      repoRoot,
-      "node_modules",
-      ".pnpm",
-      "node_modules",
-      ".bin",
-      "oxlint",
-    );
+    const oxlintBin = path.join(path.dirname(oxlintPackageJsonPath), "bin", "oxlint");
     const pluginPath = path.join(repoRoot, "oxlint-plugin-t3code", "index.ts");
 
     yield* fs.writeFileString(
@@ -112,8 +116,13 @@ export const createOxlintRuleHarness = (
     );
     yield* fs.writeFileString(sourcePath, source);
 
+    // Run through the current Node binary: oxlint's bin is an extensionless
+    // shebang script, which Windows cannot spawn directly and which would
+    // otherwise pick up whatever node is first on PATH.
     const output = yield* spawnAndCollectOutput(
-      ChildProcess.make(oxlintBin, ["--config", configPath, sourcePath], { cwd: repoRoot }),
+      ChildProcess.make(process.execPath, [oxlintBin, "--config", configPath, sourcePath], {
+        cwd: repoRoot,
+      }),
     );
 
     if (output.exitCode !== 0) {