diff --git a/src/compiler/parser.ts b/src/compiler/parser.ts
index 55312753d1e..b5564973dca 100644
--- a/src/compiler/parser.ts
+++ b/src/compiler/parser.ts
@@ -13,7 +13,7 @@ module ts {
     export function createNode(kind: SyntaxKind): Node {
         return new (getNodeConstructor(kind))();
     }
-
+
     // Invokes a callback for each child of the given node. The 'cbNode' callback is invoked for all child nodes
     // stored in properties. If a 'cbNodes' callback is specified, it is invoked for embedded arrays; otherwise,
     // embedded arrays are flattened and the 'cbNode' callback is invoked for each element. If a callback returns
@@ -386,8 +386,8 @@ module ts {
             case ParsingContext.HeritageClauses:        return Diagnostics.Unexpected_token_expected;
         }
     };
-
-    export function modifierToFlag(token: SyntaxKind): NodeFlags {
+
+    export function modifierToFlag(token: SyntaxKind): NodeFlags {
         switch (token) {
             case SyntaxKind.StaticKeyword: return NodeFlags.Static;
             case SyntaxKind.PublicKeyword: return NodeFlags.Public;
@@ -667,7 +667,6 @@ module ts {
             sourceFile = <SourceFile>createNode(SyntaxKind.SourceFile, 0);
             sourceFile.referenceDiagnostics = [];
             sourceFile.parseDiagnostics = [];
-            sourceFile.grammarDiagnostics = [];
             sourceFile.semanticDiagnostics = [];
 
             // Create and prime the scanner before parsing the source elements.
@@ -5122,4 +5121,4 @@ module ts {
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 573072efdcb..8c76cb46693 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -905,10 +905,6 @@ module ts {
         // missing tokens, or tokens it didn't know how to deal with).
         parseDiagnostics: Diagnostic[];
 
-        // Grammar errors are for  things the parser understood, but either the ES6 or TS grammars
-        // do not allow (like putting an 'public' modifier on a 'class declaration').
-        grammarDiagnostics: Diagnostic[];
-
         // Returns all syntactic diagnostics (i.e. the reference, parser and grammar diagnostics).
         getSyntacticDiagnostics(): Diagnostic[];
 
diff --git a/src/harness/harness.ts b/src/harness/harness.ts
index dc47cad5b62..bc66186d2d7 100644
--- a/src/harness/harness.ts
+++ b/src/harness/harness.ts
@@ -263,7 +263,6 @@ module Utils {
 
                     case "referenceDiagnostics":
                     case "parseDiagnostics":
-                    case "grammarDiagnostics":
                         o[propertyName] = Utils.convertDiagnostics((<any>n)[propertyName]);
                         break;
 
diff --git a/src/services/services.ts b/src/services/services.ts
index 84811489a7c..757e1b62083 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -744,7 +744,6 @@ module ts {
 
         public referenceDiagnostics: Diagnostic[];
         public parseDiagnostics: Diagnostic[];
-        public grammarDiagnostics: Diagnostic[];
         public semanticDiagnostics: Diagnostic[];
 
         public hasNoDefaultLib: boolean;