diff --git a/src/services/diagnosticServices.ts b/src/services/diagnosticServices.ts
deleted file mode 100644
index 885170a8131..00000000000
--- a/src/services/diagnosticServices.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-///<reference path='references.ts' />
-
-module TypeScript.Services {
-    export interface ILanguageServicesDiagnostics {
-        log(content: string): void;
-    }
-}
diff --git a/src/services/languageService.ts b/src/services/languageService.ts
index 894d1a83b94..8b2708856fe 100644
--- a/src/services/languageService.ts
+++ b/src/services/languageService.ts
@@ -14,7 +14,6 @@
 //
 
 ///<reference path='references.ts' />
-///<reference path='diagnosticServices.ts' />
 
 module TypeScript.Services {
 
@@ -28,7 +27,6 @@ module TypeScript.Services {
         getScriptIsOpen(fileName: string): boolean;
         getScriptByteOrderMark(fileName: string): ts.ByteOrderMark;
         getScriptSnapshot(fileName: string): TypeScript.IScriptSnapshot;
-        getDiagnosticsObject(): TypeScript.Services.ILanguageServicesDiagnostics;
         getLocalizedDiagnosticMessages(): any;
         getCancellationToken(): ts.CancellationToken;
     }
diff --git a/src/services/shims.ts b/src/services/shims.ts
index ec577c78c4a..ad6068f9743 100644
--- a/src/services/shims.ts
+++ b/src/services/shims.ts
@@ -52,7 +52,6 @@ module TypeScript.Services {
         fileExists(path: string): boolean;
         directoryExists(path: string): boolean;
         getParentDirectory(path: string): string;
-        getDiagnosticsObject(): ILanguageServicesDiagnostics;
         getLocalizedDiagnosticMessages(): string;
         getCancellationToken(): ts.CancellationToken;
     }
@@ -348,10 +347,6 @@ module TypeScript.Services {
             return this.shimHost.getScriptByteOrderMark(fileName);
         }
 
-        public getDiagnosticsObject(): ILanguageServicesDiagnostics {
-            return this.shimHost.getDiagnosticsObject();
-        }
-
         public getLocalizedDiagnosticMessages(): any {
             var diagnosticMessagesJson = this.shimHost.getLocalizedDiagnosticMessages();
             if (diagnosticMessagesJson == null || diagnosticMessagesJson == "") {