diff --git a/packages/@vuepress/core/lib/webpack/createClientConfig.js b/packages/@vuepress/core/lib/webpack/createClientConfig.js
index 79a82e427f..8ddfef2659 100644
--- a/packages/@vuepress/core/lib/webpack/createClientConfig.js
+++ b/packages/@vuepress/core/lib/webpack/createClientConfig.js
@@ -67,10 +67,6 @@ module.exports = function createClientConfig (ctx) {
       }])
   }
 
-  if (ctx.siteConfig.chainWebpack) {
-    ctx.siteConfig.chainWebpack(config, false /* isServer */)
-  }
-
   ctx.pluginAPI.options.chainWebpack.syncApply(config, false /* isServer */)
 
   return config
diff --git a/packages/@vuepress/core/lib/webpack/createServerConfig.js b/packages/@vuepress/core/lib/webpack/createServerConfig.js
index 33aeb33321..d8bf1a3731 100644
--- a/packages/@vuepress/core/lib/webpack/createServerConfig.js
+++ b/packages/@vuepress/core/lib/webpack/createServerConfig.js
@@ -56,10 +56,6 @@ module.exports = function createServerConfig (ctx) {
       }])
   }
 
-  if (ctx.siteConfig.chainWebpack) {
-    ctx.siteConfig.chainWebpack(config, true /* isServer */)
-  }
-
   ctx.pluginAPI.options.chainWebpack.syncApply(config, true /* isServer */)
 
   return config