diff --git a/packages/webpack-uni-mp-loader/lib/plugin/generate-json.js b/packages/webpack-uni-mp-loader/lib/plugin/generate-json.js
index b587e892080f4218bf23160e752b7bcc395ad5d9..97fb9ebe0de7ce64a48237b2a7896f84ccf9f3a0 100644
--- a/packages/webpack-uni-mp-loader/lib/plugin/generate-json.js
+++ b/packages/webpack-uni-mp-loader/lib/plugin/generate-json.js
@@ -51,7 +51,7 @@ function analyzeUsingComponents () {
         return false
       }
       pkgs.add(pkgRoot)
-      if (pkgs.length > 1) { // 被多个分包引用
+      if (pkgs.size > 1) { // 被多个分包引用
         return false
       }
     }