diff --git a/scripts/build/projects.js b/scripts/build/projects.js
index 38db816e23b..6f3da08c86e 100644
--- a/scripts/build/projects.js
+++ b/scripts/build/projects.js
@@ -39,7 +39,7 @@ const execTsc = (lkg, ...args) =>
     exec(process.execPath,
          [resolve(findUpRoot(), lkg ? "./lib/tsc" : "./built/local/tsc"),
           "-b", ...args],
-         { hidePrompt: true })
+         { hidePrompt: true });
 
 const projectBuilder = new ProjectQueue((projects, lkg, force) => execTsc(lkg, ...(force ? ["--force"] : []), ...projects));
 
diff --git a/src/harness/findUpDir.ts b/src/harness/findUpDir.ts
index 03b5ebdf285..3078554f61b 100644
--- a/src/harness/findUpDir.ts
+++ b/src/harness/findUpDir.ts
@@ -1,11 +1,11 @@
-namespace findUpDir {
-    import { join, resolve, dirname } from "path";
-    import { existsSync } from "fs";
+namespace Utils {
+    const { join, resolve, dirname } = require("path") as typeof import("path");
+    const { existsSync } = require("fs") as typeof import("fs");
 
     // search directories upward to avoid hard-wired paths based on the
     // build tree (same as scripts/build/findUpDir.js)
 
-    export function findUpFile(name: string) {
+    export function findUpFile(name: string): string {
         let dir = __dirname;
         while (true) {
             const fullPath = join(dir, name);
diff --git a/src/harness/harnessIO.ts b/src/harness/harnessIO.ts
index 08c11fecf12..bf9f45d8826 100644
--- a/src/harness/harnessIO.ts
+++ b/src/harness/harnessIO.ts
@@ -41,6 +41,7 @@ namespace Harness {
     export const virtualFileSystemRoot = "/";
 
     function createNodeIO(): IO {
+        const workspaceRoot = Utils.findUpRoot();
         let fs: any, pathModule: any;
         if (require) {
             fs = require("fs");
@@ -154,7 +155,7 @@ namespace Harness {
             log: s => console.log(s),
             args: () => ts.sys.args,
             getExecutingFilePath: () => ts.sys.getExecutingFilePath(),
-            getWorkspaceRoot: () => vpath.resolve(__dirname, "../.."),
+            getWorkspaceRoot: () => workspaceRoot,
             exit: exitCode => ts.sys.exit(exitCode),
             readDirectory: (path, extension, exclude, include, depth) => ts.sys.readDirectory(path, extension, exclude, include, depth),
             getAccessibleFileSystemEntries,
diff --git a/src/harness/tsconfig.json b/src/harness/tsconfig.json
index 08b9a0bc65e..37c24527730 100644
--- a/src/harness/tsconfig.json
+++ b/src/harness/tsconfig.json
@@ -28,6 +28,7 @@
         "evaluatorImpl.ts",
         "fakesHosts.ts",
         "client.ts",
+        "findUpDir.ts",
 
         "runnerbase.ts",
         "sourceMapRecorder.ts",
diff --git a/src/testRunner/parallel/host.ts b/src/testRunner/parallel/host.ts
index 421b95ef93a..819325bc85c 100644
--- a/src/testRunner/parallel/host.ts
+++ b/src/testRunner/parallel/host.ts
@@ -14,7 +14,7 @@ namespace Harness.Parallel.Host {
         const { statSync } = require("fs") as typeof import("fs");
 
         // NOTE: paths for module and types for FailedTestReporter _do not_ line up due to our use of --outFile for run.js
-        const FailedTestReporter = require(path.resolve(__dirname, "../../scripts/failed-tests")) as typeof import("../../../scripts/failed-tests");
+        const FailedTestReporter = require(Utils.findUpFile("scripts/failed-tests.js")) as typeof import("../../../scripts/failed-tests");
 
         const perfdataFileNameFragment = ".parallelperf";
         const perfData = readSavedPerfData(configOption);