diff --git a/src/timelines/MediaAttachmentGrid.tsx b/src/timelines/MediaAttachmentGrid.tsx
index 567e67c..e22a767 100644
--- a/src/timelines/MediaAttachmentGrid.tsx
+++ b/src/timelines/MediaAttachmentGrid.tsx
@@ -66,7 +66,7 @@ const MediaAttachmentGrid: Component<{
 
   css`
     .attachments {
-      column-count: ${columnCount.toString()};
+      column-count: ${columnCount().toString()};
     }
   `;
   return (