diff --git a/src/harness/harnessLanguageService.ts b/src/harness/harnessLanguageService.ts
index 03c3436f9d5..647d0729cbb 100644
--- a/src/harness/harnessLanguageService.ts
+++ b/src/harness/harnessLanguageService.ts
@@ -207,6 +207,14 @@ module Harness.LanguageService {
             return this.cancellationToken;
         }
 
+        public getCurrentDirectory(): string {
+            return "";
+        }
+
+        public getDefaultLibFilename(): string {
+            return "";
+        }
+
         public getScriptFileNames(): string {
             var fileNames: string[] = [];
             ts.forEachKey(this.fileNameToScript, (fileName) => { fileNames.push(fileName); });
diff --git a/src/services/services.ts b/src/services/services.ts
index 15929f18402..a5363eaa802 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -417,6 +417,8 @@ module ts {
         getScriptSnapshot(fileName: string): TypeScript.IScriptSnapshot;
         getLocalizedDiagnosticMessages(): any;
         getCancellationToken(): CancellationToken;
+        getCurrentDirectory(): string;
+        getDefaultLibFilename(): string;
     }
 
     //
diff --git a/src/services/shims.ts b/src/services/shims.ts
index ba7c73d87e3..5145ed96d24 100644
--- a/src/services/shims.ts
+++ b/src/services/shims.ts
@@ -53,6 +53,8 @@ module ts {
         getScriptSnapshot(fileName: string): ScriptSnapshotShim;
         getLocalizedDiagnosticMessages(): string;
         getCancellationToken(): CancellationToken;
+        getCurrentDirectory(): string;
+        getDefaultLibFilename(): string;
     }
 
     //
@@ -365,6 +367,14 @@ module ts {
         public getCancellationToken(): CancellationToken {
             return this.shimHost.getCancellationToken();
         }
+
+        public getDefaultLibFilename(): string {
+            return this.shimHost.getDefaultLibFilename();
+        }
+
+        public getCurrentDirectory(): string {
+            return this.shimHost.getCurrentDirectory();
+        }
     }
 
     function simpleForwardCall(logger: Logger, actionDescription: string, action: () => any): any {