diff --git a/lib/app/store.js b/lib/app/store.js
index 127506e66c..592731c6ef 100644
--- a/lib/app/store.js
+++ b/lib/app/store.js
@@ -44,18 +44,29 @@ if (typeof storeData !== 'function') {
 
     //if file is user/index.js
     //it should save as user
-    if (name === 'index')
+    var isIndex = (name === 'index')
+    if (isIndex)
       namePath.pop()
 
     let module = getModuleNamespace(storeData, namePath)
-
     name = namePath.pop()
-
-    //use Object.assign to deal with cases where there's a 'myModule.js' and
-    //a 'myModule' folder containing state/getters/actions/mutations
     module[name] = module[name] || {}
-    module[name] = Object.assign(module[name], getModule(filename))
-    module[name].namespaced = true
+    var fileModule = getModule(filename)
+
+    if (!isIndex) {
+      module[name] = Object.assign({}, fileModule, module[name])
+      module[name].namespaced = true
+      continue
+    }
+
+    var appendedMods = []
+    if (module[name].appends) {
+      fileModule.appends = module[name].appends
+      for (let append of module[name].appends) {
+        appendedMods[append] = module[name][append]
+      }
+    }
+    module[name] = Object.assign(module[name], fileModule, appendedMods)
   }
 
 }
@@ -97,5 +108,7 @@ function getModuleNamespace (storeData, namePath, forAppend = false) {
 
 function appendModule(module, filename, name) {
   const file = files(filename)
+  module.appends = module.appends || []
+  module.appends.push(name)
   module[name] = file.default || file
 }