diff --git a/imagefiles/install-gosu-binary.sh b/imagefiles/install-gosu-binary.sh
index 599a0a0..61a6274 100755
--- a/imagefiles/install-gosu-binary.sh
+++ b/imagefiles/install-gosu-binary.sh
@@ -14,7 +14,7 @@ if ! command -v gpg &> /dev/null; then
 fi
 
 GOSU_VERSION=1.12
-dpkgArch=$(if test "$(uname -m)" = "x86_64"; then echo amd64; else echo i386; fi)
+dpkgArch="$(dpkg --print-architecture | sed 's/.*-//')"
 url="https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-${dpkgArch}"
 url_key="https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-${dpkgArch}.asc"