diff --git a/components/tree/style/rtl.less b/components/tree/style/rtl.less
index 68040a2996..b32623e742 100644
--- a/components/tree/style/rtl.less
+++ b/components/tree/style/rtl.less
@@ -38,7 +38,7 @@
         &::before {
           .@{tree-prefix-cls}-rtl& {
             right: auto;
-            left: -@tree-title-height / 2;
+            left: -@tree-title-height / 2 - 1px;
             border-right: none;
             border-left: 1px solid @border-color-base;
           }