diff --git a/src/harness/harness.ts b/src/harness/harness.ts
index e2f3f971da3..b9bef19bfa8 100644
--- a/src/harness/harness.ts
+++ b/src/harness/harness.ts
@@ -942,7 +942,8 @@ module Harness {
                         result.sourceMaps.forEach(writeFile);
                     },
                     /*settingsCallback*/ () => { },
-                    this.compileOptions);
+                    this.compileOptions,
+                    /*currentDirectory*/ undefined);
 
                 function writeFile(file: GeneratedFile) {
                     ioHost.writeFile(file.fileName, file.code, false);
@@ -955,8 +956,7 @@ module Harness {
                 settingsCallback?: (settings: ts.CompilerOptions) => void,
                 options?: ts.CompilerOptions,
                 // Current directory is needed for rwcRunner to be able to use currentDirectory defined in json file
-                currentDirectory?: string,
-                assertInvariants = true) {
+                currentDirectory?: string) {
 
                 options = options || { noResolve: false };
                 options.target = options.target || ts.ScriptTarget.ES3;
diff --git a/src/harness/rwcRunner.ts b/src/harness/rwcRunner.ts
index 76331b8dc7d..43a118b6aec 100644
--- a/src/harness/rwcRunner.ts
+++ b/src/harness/rwcRunner.ts
@@ -106,14 +106,14 @@ module RWC {
                     opts.options.noLib = true;
 
                     // Emit the results
-                    compilerOptions = harnessCompiler.compileFiles(inputFiles, otherFiles, compileResult => {
-                        compilerResult = compileResult;
-                        },
+                    compilerOptions = harnessCompiler.compileFiles(
+                        inputFiles,
+                        otherFiles,
+                        newCompilerResults => { compilerResult = newCompilerResults; },
                         /*settingsCallback*/ undefined, opts.options,
-                        // Since all Rwc json file specified current directory in its json file, we need to pass this information to compilerHost
-                        // so that when the host is asked for current directory, it should give the value from json rather than from process
-                        currentDirectory,
-                        /*assertInvariants:*/ false);
+                        // Since each RWC json file specifies its current directory in its json file, we need
+                        // to pass this information in explicitly instead of acquiring it from the process.
+                        currentDirectory);
                 });
 
                 function getHarnessCompilerInputUnit(fileName: string) {