diff --git a/build/lib/compilation.js b/build/lib/compilation.js
index 82d144caba5..a2de56aa0ce 100644
--- a/build/lib/compilation.js
+++ b/build/lib/compilation.js
@@ -43,7 +43,7 @@ function createCompile(src, build, emitError) {
     const opts = _.clone(getTypeScriptCompilerOptions(src));
     opts.inlineSources = !!build;
     opts.noFilesystemLookup = true;
-    const ts = tsb.create(opts, true, undefined, err => new reporter(err.toString()));
+    const ts = tsb.create(opts, true, undefined, err => reporter(err.toString()));
     return function (token) {
         const utf8Filter = util.filter(data => /(\/|\\)test(\/|\\).*utf8/.test(data.path));
         const tsFilter = util.filter(data => /\.ts$/.test(data.path));
diff --git a/build/lib/compilation.ts b/build/lib/compilation.ts
index ad4c6b420b7..725e36a92eb 100644
--- a/build/lib/compilation.ts
+++ b/build/lib/compilation.ts
@@ -47,7 +47,7 @@ function createCompile(src: string, build: boolean, emitError?: boolean): (token
 	opts.inlineSources = !!build;
 	opts.noFilesystemLookup = true;
 
-	const ts = tsb.create(opts, true, undefined, err => new (<any>reporter)(err.toString()));
+	const ts = tsb.create(opts, true, undefined, err => reporter(err.toString()));
 
 	return function (token?: util.ICancellationToken) {