diff --git a/packages/material-ui-lab/src/TreeView/TreeView.d.ts b/packages/material-ui-lab/src/TreeView/TreeView.d.ts
index 2a8c357942d399..2f1591ba279c8a 100644
--- a/packages/material-ui-lab/src/TreeView/TreeView.d.ts
+++ b/packages/material-ui-lab/src/TreeView/TreeView.d.ts
@@ -1,7 +1,7 @@
 import * as React from 'react';
 import { InternalStandardProps as StandardProps } from '@material-ui/core';
 import { Theme } from '@material-ui/core/styles';
-import { SxProps} from '@material-ui/system';
+import { SxProps } from '@material-ui/system';
 
 export interface TreeViewPropsBase extends StandardProps<React.HTMLAttributes<HTMLUListElement>> {
   /**