diff --git a/src/browser/tsconfig.json b/src/browser/tsconfig.json
index 9a57c59b..212aeab8 100644
--- a/src/browser/tsconfig.json
+++ b/src/browser/tsconfig.json
@@ -3,7 +3,8 @@
   "compilerOptions": {
     "lib": [
       "dom",
-      "es2017"
+      "es2015",
+      "es2016.Array.Include"
     ],
     "outDir": "../../out",
     "types": [
diff --git a/src/common/tsconfig.json b/src/common/tsconfig.json
index 31781983..b8baa6c0 100644
--- a/src/common/tsconfig.json
+++ b/src/common/tsconfig.json
@@ -2,7 +2,8 @@
   "extends": "../tsconfig-library-base",
   "compilerOptions": {
     "lib": [
-      "es2017"
+      "es2015",
+      "es2016.Array.Include"
     ],
     "outDir": "../../out",
     "types": [