diff --git a/types/handlebars-helpers/tsconfig.json b/types/handlebars-helpers/tsconfig.json
index 1b410ff751..00459fd15e 100644
--- a/types/handlebars-helpers/tsconfig.json
+++ b/types/handlebars-helpers/tsconfig.json
@@ -5,7 +5,7 @@
             "es2015"
         ],
         "noImplicitAny": true,
-        "noImplicitThis": false,
+        "noImplicitThis": true,
         "strictNullChecks": true,
         "strictFunctionTypes": true,
         "baseUrl": "../",