diff --git a/scripts/build-aci b/scripts/build-aci
index b7efb2bccb1..7a4cff93b02 100755
--- a/scripts/build-aci
+++ b/scripts/build-aci
@@ -36,6 +36,7 @@ fi
 acbuild --debug begin
 
 TMPHOSTS="$(mktemp)"
+ACI_ARCH="$(go2aci ${GOARCH})"
 
 acbuildEnd() {
     rm "$TMPHOSTS"
@@ -71,7 +72,7 @@ acbuild --debug port add peer tcp 2380
 
 acbuild --debug copy "$TMPHOSTS" /etc/hosts
 
-acbuild --debug label add arch "$(go2aci ${GOARCH})"
+acbuild --debug label add arch "${ACI_ARCH}"
 
 # mkdir default data-dir
 mkdir -p .acbuild/currentaci/rootfs/var/lib/etcd
@@ -80,4 +81,4 @@ mkdir -p .acbuild/currentaci/rootfs/var/lib/etcd
 ln -s ./usr/local/bin/etcd .acbuild/currentaci/rootfs/etcd
 ln -s ./usr/local/bin/etcdctl .acbuild/currentaci/rootfs/etcdctl
 
-acbuild --debug write --overwrite $BUILDDIR/etcd-${1}-linux-${GOARCH}.aci
+acbuild --debug write --overwrite $BUILDDIR/etcd-${1}-linux-${ACI_ARCH}.aci