diff --git a/core/modules/system/system.theme.css b/core/modules/system/system.theme.css
index d5f41e1743444c6b5a5af9e9d4f6bba9010573bc..e25b728d0505f0976878f9928645de57e5f9ca4b 100644
--- a/core/modules/system/system.theme.css
+++ b/core/modules/system/system.theme.css
@@ -183,11 +183,11 @@ abbr.form-required, abbr.tabledrag-changed, abbr.ajax-changed {
  *
  * @see collapse.js
  */
-.js fieldset.collapsible > legend .fieldset-legend {
+.js fieldset.collapsible > legend .fieldset-legend a {
   background: url(../../misc/menu-expanded.png) 5px 65% no-repeat; /* LTR */
   padding-left: 15px; /* LTR */
 }
-.js fieldset.collapsed > legend .fieldset-legend {
+.js fieldset.collapsed > legend .fieldset-legend a {
   background-image: url(../../misc/menu-collapsed.png); /* LTR */
   background-position: 5px 50%; /* LTR */
 }