diff --git a/extensions/material.theme.config.ts b/extensions/material.theme.config.ts
index ddd7302..db511b3 100644
--- a/extensions/material.theme.config.ts
+++ b/extensions/material.theme.config.ts
@@ -15,6 +15,10 @@ const OPTIONS: IGenericObject<number> = {
 }
 
 export function activate(context: vscode.ExtensionContext) {
+  if (vscode.workspace.getConfiguration().has('materialTheme.cache.workbench.accent')) {
+    vscode.workspace.getConfiguration().update('materialTheme.cache.workbench.accent', undefined, true);
+  }
+
   // registering the command
   let command = vscode.commands.registerCommand('material.theme.config', () => {
     // the user is going to choose what aspect of theme to config
diff --git a/package.json b/package.json
index f641967..1faa68e 100644
--- a/package.json
+++ b/package.json
@@ -54,6 +54,11 @@
     ],
     "configuration": {
       "properties": {
+        "materialTheme.cache.workbench.accent": {
+          "type": "string",
+          "title": "[DEPRECATED] This is an old property.",
+          "description": "This property is intended only for migrating old settings system to a new one. It will be removed in new versions. Don't use it, use \"materialTheme.cache.workbench.settings\" instead."
+        },
         "materialTheme.cache.workbench.settings": {
           "default": {},
           "type": "object",