diff --git a/packages/base-styles/_z-index.scss b/packages/base-styles/_z-index.scss
index f8da65608ed1f..0ce90bec9c097 100644
--- a/packages/base-styles/_z-index.scss
+++ b/packages/base-styles/_z-index.scss
@@ -87,7 +87,7 @@ $z-layers: (
 	".interface-interface-skeleton__sidebar": 100000,
 	".editor-layout__toggle-sidebar-panel": 100000,
 	".edit-widgets-sidebar": 100000,
-	".edit-post-layout .edit-post-post-publish-panel": 100001,
+	".editor-post-publish-panel": 100001,
 	// For larger views, the wp-admin navbar dropdown should be at top of
 	// the Publish Post sidebar.
 	".editor-post-publish-panel {greater than small}": 99998,