diff --git a/backend/internal/repository/account_repo.go b/backend/internal/repository/account_repo.go
index 19dff447..aa880269 100644
--- a/backend/internal/repository/account_repo.go
+++ b/backend/internal/repository/account_repo.go
@@ -334,7 +334,7 @@ func (r *accountRepository) BatchUpdateLastUsed(ctx context.Context, updates map
 
 	idx := 1
 	for id, ts := range updates {
-		caseSQL += " WHEN $" + itoa(idx) + " THEN $" + itoa(idx+1)
+		caseSQL += " WHEN $" + itoa(idx) + " THEN $" + itoa(idx+1) + "::timestamptz"
 		args = append(args, id, ts)
 		ids = append(ids, id)
 		idx += 2