diff --git a/packages/vant/src/config-provider/types.ts b/packages/vant/src/config-provider/types.ts
index 69affd1ca..896bdc79a 100644
--- a/packages/vant/src/config-provider/types.ts
+++ b/packages/vant/src/config-provider/types.ts
@@ -44,7 +44,7 @@ type BaseThemeVars = {
   paddingXl?: string;
 
   // Font
-  fontSizexs?: string;
+  fontSizeXs?: string;
   fontSizeSm?: string;
   fontSizeMd?: string;
   fontSizeLg?: string;