diff --git a/types/sequencify/tsconfig.json b/types/sequencify/tsconfig.json
index a0f1b28bcf..487ca81db3 100644
--- a/types/sequencify/tsconfig.json
+++ b/types/sequencify/tsconfig.json
@@ -7,7 +7,8 @@
         "module": "commonjs",
         "target": "es6",
         "noImplicitAny": true,
-        "strictNullChecks": false,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
         "baseUrl": "../",
         "typeRoots": [
             "../"