diff --git a/src/harness/fourslash.ts b/src/harness/fourslash.ts
index be03b148be0..2d81524bf6d 100644
--- a/src/harness/fourslash.ts
+++ b/src/harness/fourslash.ts
@@ -167,6 +167,7 @@ module FourSlash {
                             settings.module = ts.ModuleKind.CommonJS;
                             break;
                           default:
+                            ts.Debug.assert(typeof globalOptions[prop] === "undefined" || globalOptions[prop] === "None");
                             settings.module = ts.ModuleKind.None;
                             break;
                         }
diff --git a/src/services/shims.ts b/src/services/shims.ts
index 5e4ebaf0d06..a86d1f5231d 100644
--- a/src/services/shims.ts
+++ b/src/services/shims.ts
@@ -222,7 +222,7 @@ module ts {
                 throw Error("LanguageServiceShimHostAdapter.getCompilationSettings: empty compilationSettings");
                 return null;
             }
-            return <CompilerOptions>JSON.parse(<any>settingsJson);
+            return <CompilerOptions>JSON.parse(settingsJson);
         }
 
         public getScriptFileNames(): string[] {