diff --git a/bin/build-gensite b/bin/build-gensite
index 58e1e82..ea15cd7 100755
--- a/bin/build-gensite
+++ b/bin/build-gensite
@@ -3,9 +3,9 @@
 set -euo pipefail
 
 if [[ $(uname) = "Linux" ]]; then
-  build_platform_dir="x86_64-unknown-linux"
+    build_platform_dir="$(arch)-unknown-linux"
 else
-  build_platform_dir="x86_64-apple-macosx"
+    build_platform_dir="$(arch)-apple-macosx"
 fi
 
 pushd "gensite" >/dev/null