diff --git a/package.json b/package.json
index 874bd43a0..19de3a2b8 100644
--- a/package.json
+++ b/package.json
@@ -90,7 +90,7 @@
     "@types/is-negated-glob": "^1.0.0",
     "@types/mocha": "^5.2.7",
     "@types/multimatch": "^2.1.3",
-    "@types/node": "^12.6.2",
+    "@types/node": "^12.6.3",
     "@types/ts-nameof": "^3.2.0",
     "chai": "^4.2.0",
     "chalk": "^2.4.2",
diff --git a/src/fileSystem/DefaultFileSystemHost.ts b/src/fileSystem/DefaultFileSystemHost.ts
index e1b54d915..4d6b7ae7f 100644
--- a/src/fileSystem/DefaultFileSystemHost.ts
+++ b/src/fileSystem/DefaultFileSystemHost.ts
@@ -153,6 +153,8 @@ export class DefaultFileSystemHost implements FileSystemHost {
     }
 
     glob(patterns: ReadonlyArray<string>) {
+        // convert backslashes to foward
+        patterns = patterns.map(p => p.replace(/\\/g, "/")); // maybe this isn't full-proof?
         return this.globby.sync(patterns, {
             cwd: this.getCurrentDirectory(),
             absolute: true
diff --git a/src/tests/projectTests.ts b/src/tests/projectTests.ts
index 73ba9e928..6540aa272 100644
--- a/src/tests/projectTests.ts
+++ b/src/tests/projectTests.ts
@@ -836,7 +836,7 @@ describe(nameof(Project), () => {
 
     describe("mixing real files with virtual files", () => {
         function createProject() {
-            const testFilesDirPath = path.join(__dirname, "../../src/tests/testFiles").replace(/\\/g, "/");
+            const testFilesDirPath = path.join(__dirname, "../../src/tests/testFiles");
             const project = new Project();
             project.addExistingSourceFiles(`${testFilesDirPath}/**/*.ts`);
             project.createSourceFile(
diff --git a/yarn.lock b/yarn.lock
index 3d8458de2..5a5d50a35 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -159,10 +159,14 @@
   dependencies:
     "@types/minimatch" "*"
 
-"@types/node@*", "@types/node@^12.6.2":
+"@types/node@*":
   version "12.6.2"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-12.6.2.tgz#a5ccec6abb6060d5f20d256fb03ed743e9774999"
 
+"@types/node@^12.6.3":
+  version "12.6.3"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-12.6.3.tgz#44d507c5634f85e7164707ca36bba21b5213d487"
+
 "@types/ts-nameof@^3.2.0":
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/@types/ts-nameof/-/ts-nameof-3.2.0.tgz#77c68c06471d3fab031ca1a2113fe1ffbe95c86f"