diff --git a/tsconfig.json b/tsconfig.json
index 2b8a0a0302..387d9840c6 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -8,7 +8,7 @@
     "strictFunctionTypes": false,
     "strictPropertyInitialization": false,
     "noImplicitAny": true,
-    "noImplicitThis": false,
+    "noImplicitThis": true,
     "useUnknownInCatchVariables": false,
     "module": "es6",
     "target": "es5",