diff --git a/components/auto-complete/index.tsx b/components/auto-complete/index.tsx
index 5534e1939a90..1c114d72945d 100755
--- a/components/auto-complete/index.tsx
+++ b/components/auto-complete/index.tsx
@@ -147,7 +147,7 @@ const AutoComplete: React.ForwardRefRenderFunction<RefSelectProps, AutoCompleteP
             ref={ref}
             {...omit(props, ['dataSource'])}
             prefixCls={prefixCls}
-            dropdownClassName={popupClassName || dropdownClassName}
+            popupClassName={popupClassName || dropdownClassName}
             className={classNames(`${prefixCls}-auto-complete`, className)}
             mode={Select.SECRET_COMBOBOX_MODE_DO_NOT_USE as any}
             {...{