diff --git a/content/treestyletab/treestyletab.css b/content/treestyletab/treestyletab.css
index 6455d01a..7b1d33ec 100644
--- a/content/treestyletab/treestyletab.css
+++ b/content/treestyletab/treestyletab.css
@@ -16,6 +16,7 @@ tabbrowser[treestyletab-allow-subtree-collapse="true"] .tabbrowser-tab[treestyle
 	display: -moz-box;
 }
 
+tabbrowser:not([treestyletab-allow-subtree-collapse="true"]) .treestyletab-twisty-container,
 tabbrowser[treestyletab-allow-subtree-collapse="true"] .tabbrowser-tab[treestyletab-collapsed-done="true"],
 .tabbrowser-strip[collapsed="true"]+splitter:not([state="collapsed"]),
 tabbrowser[treestyletab-tabbar-autohide="hidden"] .tabbrowser-strip,