diff --git a/main.sh b/main.sh
index a29e0278a..8c0859622 100755
--- a/main.sh
+++ b/main.sh
@@ -6,6 +6,8 @@ set -e
 
 VERSION="$PIKA_PACKAGE_VERSION"
 
+echo "$PIKA_BUILD_ARCH" > pika-build-arch
+
 apt-get source "$PIKA_PACKAGE_NAME=$VERSION" -y
 
 if [ "$PIKA_REBUILD" = true ] ; then
diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index b13e08d75..9eadfb7b0 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -2,4 +2,4 @@ export PIKA_PACKAGE_VERSION="1:3.5.1-12"
 export PIKA_PACKAGE_NAME="amanda"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
-export PIKA_REBUILD_VERSION="b3"
+export PIKA_REBUILD_VERSION="b2"