diff --git a/rules/core/es6.js b/rules/core/es6.js
index df43de0c..db0e4c07 100644
--- a/rules/core/es6.js
+++ b/rules/core/es6.js
@@ -12,7 +12,7 @@ module.exports = {
     "no-class-assign": "error",
     "no-const-assign": "error",
     "no-dupe-class-members": "error",
-    "no-duplicate-imports": "off", // => `import/no-duplicates`
+    "no-duplicate-imports": "error",
     "no-new-symbol": "error",
     "no-restricted-exports": "off",
     "no-restricted-imports": "off",
diff --git a/rules/plugins/import.js b/rules/plugins/import.js
index 93e8b935..b39d2eef 100644
--- a/rules/plugins/import.js
+++ b/rules/plugins/import.js
@@ -24,6 +24,7 @@ module.exports = {
     "import/no-cycle": "error",
     "import/no-default-export": "off",
     "import/no-deprecated": "error",
+    "import/no-duplicates": "off", // use core rule `no-duplicate-imports`
     "import/no-dynamic-require": "warn",
     "import/no-extraneous-dependencies": [
       "error",