diff --git a/vendors/bootstrap/less/dropdowns.less b/vendors/bootstrap/less/dropdowns.less
index b42509b08..0cb61fad7 100644
--- a/vendors/bootstrap/less/dropdowns.less
+++ b/vendors/bootstrap/less/dropdowns.less
@@ -24,7 +24,7 @@
   margin: 2px 0 0; // override default ul
   list-style: none;
   color: var(--dropdown-menu-color, inherit);
-  background-color: var(--dropdown-menu-background-color, @dropdownBackground);
+  background-color: var(--dropdown-menu-bg-color, @dropdownBackground);
   border: 1px solid @dropdownBorder;
   box-shadow: 0 1px 2px rgba(0,0,0,0.2);
   background-clip: padding-box;