diff --git a/css/blockquote_attribution.admin.css b/css/blockquote_attribution.admin.css
index 9824e0d..e2fa699 100644
--- a/css/blockquote_attribution.admin.css
+++ b/css/blockquote_attribution.admin.css
@@ -1,3 +1,7 @@
 .ckeditor5-toolbar-button-blockquoteAttribution {
   background-image: url('../js/build/blockquote_attribution.admin.svg');
 }
+
+.ckeditor5-toolbar-button-blockquote_attribution {
+  background-image: url('../js/build/blockquote_attribution.admin.svg');
+}