diff --git a/src/components/attachment-thumbs.tsx b/src/components/attachment-thumbs.tsx
index 4829b7688..641765da3 100644
--- a/src/components/attachment-thumbs.tsx
+++ b/src/components/attachment-thumbs.tsx
@@ -4,11 +4,10 @@ import { openModal } from 'soapbox/actions/modals.ts';
 import { MediaGallery } from 'soapbox/features/ui/util/async-components.ts';
 import { useAppDispatch } from 'soapbox/hooks/useAppDispatch.ts';
 
-import type { List as ImmutableList } from 'immutable';
 import type { Attachment } from 'soapbox/types/entities.ts';
 
 interface IAttachmentThumbs {
-  media: ImmutableList<Attachment>;
+  media: Attachment[];
   onClick?(): void;
   sensitive?: boolean;
 }
@@ -18,7 +17,7 @@ const AttachmentThumbs = (props: IAttachmentThumbs) => {
   const dispatch = useAppDispatch();
 
   const fallback = <div className='!h-[50px] bg-transparent' />;
-  const onOpenMedia = (media: ImmutableList<Attachment>, index: number) => dispatch(openModal('MEDIA', { media, index }));
+  const onOpenMedia = (media: Attachment[], index: number) => dispatch(openModal('MEDIA', { media, index }));
 
   return (
     <div className='relative'>
@@ -44,4 +43,4 @@ const AttachmentThumbs = (props: IAttachmentThumbs) => {
   );
 };
 
-export default AttachmentThumbs;
+export default AttachmentThumbs;
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