diff --git a/components/style/themes/dark.less b/components/style/themes/dark.less
index 55c59ec50d..8e4fc99ff9 100644
--- a/components/style/themes/dark.less
+++ b/components/style/themes/dark.less
@@ -262,7 +262,6 @@
 @input-bg: transparent;
 @input-placeholder-color: fade(@white, 30%);
 @input-icon-color: fade(@white, 30%);
-@input-number-handler-bg: transparent;
 @input-number-handler-active-bg: @item-hover-bg;
 @input-icon-hover-color: fade(@white, 85%);