diff --git a/tsconfig.json b/tsconfig.json
index e56930e6..bcba358d 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,10 +3,10 @@
     "module": "commonjs",
     "target": "es5",
     "lib": [
-      "DOM",
-      "ES5",
-      "ScriptHost",
-      "ES2015.Promise"
+      "dom",
+      "es5",
+      "scripthost",
+      "es2015.promise"
     ],
     "rootDir": "src",
     "outDir": "lib",