diff --git a/modesl/tsconfig.json b/modesl/tsconfig.json
index c3a8497fd1..bf010625e0 100644
--- a/modesl/tsconfig.json
+++ b/modesl/tsconfig.json
@@ -2,6 +2,7 @@
     "compilerOptions": {
         "module": "commonjs",
         "target": "es6",
+        "lib": ["es6"],
         "noImplicitAny": true,
         "noImplicitThis": true,
         "strictNullChecks": true,