diff --git a/src/app.js b/src/app.js
index 58a6ae764e..6c7016b15c 100644
--- a/src/app.js
+++ b/src/app.js
@@ -369,7 +369,6 @@ var run = function () {
 
   // ----------------- resizeable ui ---------------
 
-  var EDITOR_SIZE_KEY = 'editor-size-cache'
   var EDITOR_WINDOW_SIZE = 'editorWindowSize'
 
   var dragging = false
@@ -413,14 +412,6 @@ var run = function () {
     }
   })
 
-  // convert old browser-solidity
-  if (storage.exists(EDITOR_SIZE_KEY)) {
-    if (!config.exists(EDITOR_WINDOW_SIZE)) {
-      config.set(EDITOR_WINDOW_SIZE, storage.get(EDITOR_SIZE_KEY))
-    }
-    storage.remove(EDITOR_SIZE_KEY)
-  }
-
   if (config.exists(EDITOR_WINDOW_SIZE)) {
     setEditorSize(config.get(EDITOR_WINDOW_SIZE))
   } else {
diff --git a/src/app/storage.js b/src/app/storage.js
index f6dc715bb9..eb305531b4 100644
--- a/src/app/storage.js
+++ b/src/app/storage.js
@@ -49,6 +49,9 @@ function Storage () {
       window.localStorage.removeItem(name)
     }
   })
+
+  // remove obsolete key
+  window.localStorage.removeItem('editor-size-cache')
 }
 
 module.exports = Storage