diff --git a/Dockerfile b/Dockerfile
index 0ce255b..8c011dd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,16 +1,11 @@
 FROM debian:bullseye-slim
 
 ARG TARGETPLATFORM
-ARG ARCH=$(case ${TARGETPLATFORM:-linux/amd64} in \
-  "linux/amd64")   echo "amd64"  ;; \
-  "linux/arm64")   echo "aarch64" ;; \
-  *)               echo ""        ;; esac)
+# ARG ARCH=$(case ${TARGETPLATFORM:-linux/amd64} in \
+#   "linux/amd64")   echo "amd64"  ;; \
+#   "linux/arm64")   echo "aarch64" ;; \
+#   *)               echo ""        ;; esac)
 ARG S6_VERSION="2.2.0.3"
-RUN export ARCH=$(case ${TARGETPLATFORM:-linux/amd64} in \
-  "linux/amd64")   echo "amd64"  ;; \
-  "linux/arm64")   echo "aarch64" ;; \
-  *)               echo ""        ;; esac) \
-  && echo "ARCH=${ARCH}, ARCH2=$ARCH"
 
 ENV DEBIAN_FRONTEND="noninteractive" \
   HOME="/root" \
@@ -18,11 +13,19 @@ ENV DEBIAN_FRONTEND="noninteractive" \
   LANG="en_US.UTF-8" \
   LC_ALL="en_US.UTF-8" \
   TERM="xterm" \
-  S6_EXPECTED_SHA256="a7076cf205b331e9f8479bbb09d9df77dbb5cd8f7d12e9b74920902e0c16dd98" \
   S6_DOWNLOAD="https://github.com/just-containers/s6-overlay/releases/download/v${S6_VERSION}/s6-overlay-${ARCH}.tar.gz"
 
 # Install third party software
-RUN set -x && \
+RUN export ARCH=$(case ${TARGETPLATFORM:-linux/amd64} in \
+  "linux/amd64")   echo "amd64"  ;; \
+  "linux/arm64")   echo "aarch64" ;; \
+  *)               echo ""        ;; esac) && \
+  export S6_EXPECTED_SHA256=$(case ${TARGETPLATFORM:-linux/amd64} in \
+  "linux/amd64")   echo "a7076cf205b331e9f8479bbb09d9df77dbb5cd8f7d12e9b74920902e0c16dd98"  ;; \
+  "linux/arm64")   echo "84f585a100b610124bb80e441ef2dc2d68ac2c345fd393d75a6293e0951ccfc5" ;; \
+  *)               echo ""        ;; esac) && \
+  echo "Building for arch: ${ARCH}, expecting S6 SHA256: ${S6_EXPECTED_SHA256}" && \
+  set -x && \
   apt-get update && \
   apt-get -y --no-install-recommends install locales && \
   echo "en_US.UTF-8 UTF-8" > /etc/locale.gen && \