diff --git a/packages/@vue/cli-service-global/lib/globalConfigPlugin.js b/packages/@vue/cli-service-global/lib/globalConfigPlugin.js
index ddda032955..a98bd7d075 100644
--- a/packages/@vue/cli-service-global/lib/globalConfigPlugin.js
+++ b/packages/@vue/cli-service-global/lib/globalConfigPlugin.js
@@ -115,7 +115,7 @@ module.exports = function createConfigPlugin (context, entry, asLib) {
                   },
                   rules: {
                     'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'off',
-                    'no-debugger': `process.env.NODE_ENV === 'production' ? 'error' : 'off'`
+                    'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off'
                   }
                 }
               }))