diff --git a/packages/client/src/components/MkNoteSub.vue b/packages/client/src/components/MkNoteSub.vue
index e90c3da14d..c204cb2f9f 100644
--- a/packages/client/src/components/MkNoteSub.vue
+++ b/packages/client/src/components/MkNoteSub.vue
@@ -287,7 +287,7 @@ const replies: misskey.entities.Note[] = props.conversation?.filter(item => item
 				--indent: calc(var(--avatarSize) - 4px);
 			}
 		}
-		.firstColumn {
+		&.firstColumn {
 			> .main, > .line, > .children:not(.single) > .line {
 				--avatarSize: 35px;
 				--indent: 35px;