diff --git a/package.json b/package.json
index 48203b2c230..66d66b261f7 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
     "name": "typescript",
     "author": "Microsoft Corp.",
     "homepage": "http://typescriptlang.org/",
-    "version": "1.9.0",
+    "version": "1.8.0",
     "license": "Apache-2.0",
     "description": "TypeScript is a language for application scale JavaScript development",
     "keywords": [
diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index 3fed8dcb596..398ce27ef48 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -12,7 +12,7 @@ namespace ts {
 
     const emptyArray: any[] = [];
 
-    export const version = "1.9.0";
+    export const version = "1.8.0";
 
     export function findConfigFile(searchPath: string, fileExists: (fileName: string) => boolean): string {
         let fileName = "tsconfig.json";
diff --git a/src/services/shims.ts b/src/services/shims.ts
index e836eeed3e0..9ca3f19244d 100644
--- a/src/services/shims.ts
+++ b/src/services/shims.ts
@@ -1057,6 +1057,6 @@ namespace TypeScript.Services {
 // TODO: it should be moved into a namespace though.
 
 /* @internal */
-const toolsVersion = "1.9";
+const toolsVersion = "1.8";
 
 /* tslint:enable:no-unused-variable */
\ No newline at end of file