diff --git a/themes/neue-dark-ui/ui-sizes.less b/themes/neue-dark-ui/ui-sizes.less
new file mode 100644
index 000000000..5a2fda7bf
--- /dev/null
+++ b/themes/neue-dark-ui/ui-sizes.less
@@ -0,0 +1 @@
+@disclosure-arrow-size: 12px;