diff --git a/src/components/theme/getRootClassName.ts b/src/components/theme/getRootClassName.ts
index f3c81b0ef4..92b621a263 100644
--- a/src/components/theme/getRootClassName.ts
+++ b/src/components/theme/getRootClassName.ts
@@ -1,11 +1,12 @@
 import {block} from '../utils/cn';
 
 import {ROOT_CLASSNAME} from './constants';
+import type {RealTheme} from './types';
 
 const b = block(ROOT_CLASSNAME);
 
 interface RootMods {
-    theme?: string;
+    theme?: RealTheme;
 }
 
 export function getRootClassName({theme}: RootMods = {}, className?: string) {