diff --git a/packages/twenty-front/src/modules/activities/files/hooks/useUploadAttachmentFile.tsx b/packages/twenty-front/src/modules/activities/files/hooks/useUploadAttachmentFile.tsx
index b872acab5..2d94d15d8 100644
--- a/packages/twenty-front/src/modules/activities/files/hooks/useUploadAttachmentFile.tsx
+++ b/packages/twenty-front/src/modules/activities/files/hooks/useUploadAttachmentFile.tsx
@@ -45,6 +45,7 @@ export const useUploadAttachmentFile = () => {
       fullPath: attachmentUrl,
       type: getFileType(file.name),
       [targetableObjectFieldIdName]: targetableObject.id,
+      createdAt: new Date().toISOString(),
     } as Partial<Attachment>;
 
     await createOneAttachment(attachmentToCreate);
diff --git a/packages/twenty-front/src/modules/attachments/types/Attachment.ts b/packages/twenty-front/src/modules/attachments/types/Attachment.ts
index 657ce6b48..563e516d2 100644
--- a/packages/twenty-front/src/modules/attachments/types/Attachment.ts
+++ b/packages/twenty-front/src/modules/attachments/types/Attachment.ts
@@ -1,6 +1,6 @@
 export type Attachment = {
   id: string;
-  createdAt: Date;
+  createdAt: string;
   updatedAt: Date;
   deletedAt: Date | null;
 };