diff --git a/types/jquery-sortable/tsconfig.json b/types/jquery-sortable/tsconfig.json
index 2a77692104..8bf1bf725e 100644
--- a/types/jquery-sortable/tsconfig.json
+++ b/types/jquery-sortable/tsconfig.json
@@ -6,7 +6,7 @@
             "dom"
         ],
         "noImplicitAny": true,
-        "noImplicitThis": false,
+        "noImplicitThis": true,
         "strictNullChecks": false,
         "strictFunctionTypes": true,
         "baseUrl": "../",
@@ -21,4 +21,4 @@
         "index.d.ts",
         "jquery-sortable-tests.ts"
     ]
-}
\ No newline at end of file
+}