diff --git a/.eslintrc.js b/.eslintrc.js
index 79bc5dd..e5f563c 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -16,6 +16,12 @@ module.exports = {
   rules: {
     "@typescript-eslint/no-var-requires": 0,
     "@typescript-eslint/explicit-module-boundary-types": 0,
+    "prettier/prettier": [
+      "error",
+      {
+        endOfLine: "auto",
+      },
+    ],
   },
   ignorePatterns: ["lib", "coverage"],
 };
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index bf0d164..59b288d 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -9,12 +9,23 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+          - windows-latest
+        node_version:
+          - 20
+        architecture:
+          - x64
+    name: tests on ${{ matrix.node_version }} - ${{ matrix.architecture }} on ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v1
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: ${{ matrix.node_version }}
+          architecture: ${{ matrix.architecture }}
       - run: yarn
       - run: chmod +x ./bin/run
       - run: yarn test:ci
diff --git a/src/core/validateGeneratedTypes.ts b/src/core/validateGeneratedTypes.ts
index 8d79b76..a1ba66a 100644
--- a/src/core/validateGeneratedTypes.ts
+++ b/src/core/validateGeneratedTypes.ts
@@ -4,7 +4,7 @@ import {
   createVirtualTypeScriptEnvironment,
 } from "@typescript/vfs";
 import ts from "typescript";
-import { join } from "path";
+import { join, sep, posix } from "path";
 import { resolveDefaultProperties } from "../utils/resolveDefaultProperties";
 import { fixOptionalAny } from "../utils/fixOptionalAny";
 interface File {
@@ -37,7 +37,7 @@ export function validateGeneratedTypes({
   const fsMap = createDefaultMapFromNodeModules({
     target: compilerOptions.target,
   });
-  const projectRoot = process.cwd();
+  const projectRoot = makePosixPath(process.cwd());
   const src = fixOptionalAny(
     skipParseJSDoc
       ? sourceTypes.sourceText
@@ -116,5 +116,9 @@ function getDetails(file: ts.SourceFile, line: number) {
 }
 
 function getPath(file: File) {
-  return join(process.cwd(), file.relativePath);
+  return makePosixPath(join(process.cwd(), file.relativePath));
+}
+
+function makePosixPath(str: string) {
+  return str.split(sep).join(posix.sep);
 }