diff --git a/skin/classic/treestyletab/ui-base.css b/skin/classic/treestyletab/ui-base.css
index 7cb973b0..29cb5ae2 100644
--- a/skin/classic/treestyletab/ui-base.css
+++ b/skin/classic/treestyletab/ui-base.css
@@ -338,7 +338,7 @@ tabbrowser[treestyletab-tabbar-position="bottom"]
 }
 
 .tabbrowser-tabs[treestyletab-mode="vertical"]
-  .tab-content[pinned="true"] > image {
+  .tab-content[pinned="true"] > image:not(.tab-icon-overlay) {
 	height: 16px;
 	margin: 0;
 	padding: 0;
@@ -356,13 +356,6 @@ tabbrowser[treestyletab-tabbar-position="bottom"]
 	background-image: none;
 }
 
-/* overlay icon */
-.tabbrowser-tabs[treestyletab-mode="vertical"]
-  .tab-content[pinned="true"] > image.tab-icon-overlay {
-  margin-top: -14px !important;
-  -moz-margin-start: -8px !important;
-}
-
 
 /* notification of newly opened tabs in background */