diff --git a/src/index.ts b/src/index.ts
index a6254b5f..808234e9 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -19,6 +19,10 @@ const equivalents = [
   'space-before-function-paren'
 ] as const
 
+function clone<T extends object | string | number | boolean | null> (value: T): T {
+  return JSON.parse(JSON.stringify(value))
+}
+
 function fromEntries<T> (iterable: Array<[string, T]>): { [key: string]: T } {
   return [...iterable].reduce<{ [key: string]: T }>((obj, [key, val]) => {
     obj[key] = val
@@ -44,7 +48,7 @@ export = {
         'no-use-before-define': 'off',
 
         // @typescript-eslint versions of Standard.js rules:
-        ...fromEntries(equivalents.map((name) => [`@typescript-eslint/${name}`, standardRules[name]])),
+        ...fromEntries(equivalents.map((name) => [`@typescript-eslint/${name}`, clone(standardRules[name])])),
         '@typescript-eslint/no-use-before-define': ['error', {
           functions: false,
           classes: false,