diff --git a/src/harness/harness.ts b/src/harness/harness.ts
index 5581755d0b0..5d8e051124c 100644
--- a/src/harness/harness.ts
+++ b/src/harness/harness.ts
@@ -801,7 +801,9 @@ namespace Harness {
 namespace Harness {
     export const libFolder = "built/local/";
     const tcServicesFileName = ts.combinePaths(libFolder, Utils.getExecutionEnvironment() === Utils.ExecutionEnvironment.Browser ? "typescriptServicesInBrowserTest.js" : "typescriptServices.js");
-    export const tcServicesFile = IO.readFile(tcServicesFileName) + IO.newLine() + `//# sourceURL=${IO.resolvePath(tcServicesFileName)}`;
+    export const tcServicesFile = IO.readFile(tcServicesFileName) + (Utils.getExecutionEnvironment() !== Utils.ExecutionEnvironment.Browser
+        ? IO.newLine() + `//# sourceURL=${IO.resolvePath(tcServicesFileName)}`
+        : "");
 
     export interface SourceMapEmitterCallback {
         (emittedFile: string, emittedLine: number, emittedColumn: number, sourceFile: string, sourceLine: number, sourceColumn: number, sourceName: string): void;