diff --git a/res/themes/dark/css/_dark.scss b/res/themes/dark/css/_dark.scss
index a878aa3cdd..f6f415ce70 100644
--- a/res/themes/dark/css/_dark.scss
+++ b/res/themes/dark/css/_dark.scss
@@ -42,6 +42,9 @@ $preview-bar-bg-color: $header-panel-bg-color;
 $groupFilterPanel-bg-color: rgba(38, 39, 43, 0.82);
 $inverted-bg-color: $base-color;
 
+// used by RoomDropTarget
+$droptarget-bg-color: rgba(21,25,30,0.95);
+
 // used by AddressSelector
 $selected-color: $room-highlight-color;