diff --git a/local/build-all.R b/local/build-all.R
index 3476a22..f10468b 100644
--- a/local/build-all.R
+++ b/local/build-all.R
@@ -49,9 +49,10 @@ s3fs::s3_file_system(
   refresh = TRUE
 )
 codename <- bincraft::set_codename(NULL)
+local_arch <- Sys.info()[["machine"]]
+arch <- if (grepl("arm64|aarch64", local_arch)) "arm64" else "amd64"
 s3_cache <- basename(s3fs::s3_dir_ls(
-  sprintf("devxy-rpkgs-binaries/%s/%s/latest/src/contrib",
-    Sys.info()[["machine"]], codename),
+  sprintf("devxy-rpkgs-binaries/%s/%s/latest/src/contrib", arch, codename),
   recurse = TRUE
 ))
 sprintf("S3 cache: %s files", length(s3_cache))