diff --git a/src/less/base/tree/tree.expander.less b/src/less/base/tree/tree.expander.less
index e6bfe1885..371e39eec 100644
--- a/src/less/base/tree/tree.expander.less
+++ b/src/less/base/tree/tree.expander.less
@@ -14,6 +14,6 @@
 
 .bi-theme-dark {
   .bi-tree-expander-popup.line.solid:before {
-    border-left: 1px solid @border-color-dark-gray-line-theme-dark;
+    border-left: 1px solid @color-bi-border-tree-expander-popup-line-theme-dark;
   }
 }
diff --git a/src/less/lib/theme.less b/src/less/lib/theme.less
index fd0fe3e22..9575a2ae1 100644
--- a/src/less/lib/theme.less
+++ b/src/less/lib/theme.less
@@ -197,7 +197,7 @@
 // tree
 @color-bi-text-display-tree: @color-bi-text-gray;
 @color-bi-border-tree-expander-popup-line: @color-bi-border-dark-gray-line;
-@color-bi-border-tree-expander-popup-line-theme-dark: @color-bi-background-default-theme-dark;
+@color-bi-border-tree-expander-popup-line-theme-dark: @color-bi-border-dark-gray-line-theme-dark;
 // popup
 @color-bi-background-list-view-shadow: @color-bi-background-black;
 @color-bi-border-list-view-toolbar: @color-bi-border-line;