diff --git a/Dockerfile b/Dockerfile
index e4b24720..ae38a2df 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,15 +7,18 @@ ARG VERSION
 
 ARG TARGETPLATFORM
 ARG BUILDPLATFORM
-RUN printf "I am running on ${BUILDPLATFORM:-linux/amd64}, building for ${TARGETPLATFORM:-linux/amd64}\n$(uname -a)\n"
-
-RUN [ "$TARGETPLATFORM" = "linux/amd64"   ] && echo GOOS=linux GOARCH=amd64 > /tmp/.env || true
-RUN [ "$TARGETPLATFORM" = "linux/arm/v6"  ] && echo GOOS=linux GOARCH=arm GOARM=6 > /tmp/.env || true
-RUN [ "$TARGETPLATFORM" = "linux/arm/v7"  ] && echo GOOS=linux GOARCH=arm GOARM=7 > /tmp/.env || true
-RUN [ "$TARGETPLATFORM" = "linux/arm64"   ] && echo GOOS=linux GOARCH=arm64 > /tmp/.env || true
-RUN [ "$TARGETPLATFORM" = "linux/386"     ] && echo GOOS=linux GOARCH=386 > /tmp/.env || true
-RUN [ "$TARGETPLATFORM" = "linux/ppc64le" ] && echo GOOS=linux GOARCH=ppc64le > /tmp/.env || true
-RUN [ "$TARGETPLATFORM" = "linux/s390x"   ] && echo GOOS=linux GOARCH=s390x > /tmp/.env || true
+RUN printf "I am running on ${BUILDPLATFORM:-linux/amd64}, building for ${TARGETPLATFORM:-linux/amd64}\n$(uname -a)\n" \
+  && $(case ${TARGETPLATFORM:-linux/amd64} in \
+      "linux/amd64")   echo "GOOS=linux GOARCH=amd64" > /tmp/.env                       ;; \
+      "linux/arm/v6")  echo "GOOS=linux GOARCH=arm GOARM=6" > /tmp/.env                 ;; \
+      "linux/arm/v7")  echo "GOOS=linux GOARCH=arm GOARM=7" > /tmp/.env                 ;; \
+      "linux/arm64")   echo "GOOS=linux GOARCH=arm64" > /tmp/.env                       ;; \
+      "linux/386")     echo "GOOS=linux GOARCH=386" > /tmp/.env                         ;; \
+      "linux/ppc64le") echo "GOOS=linux GOARCH=ppc64le" > /tmp/.env                     ;; \
+      "linux/s390x")   echo "GOOS=linux GOARCH=s390x" > /tmp/.env                       ;; \
+      *)               echo "TARGETPLATFORM ${TARGETPLATFORM} not found..." && exit 1   ;; \
+    esac) \
+  && cat /tmp/.env
 RUN env $(cat /tmp/.env | xargs) go env
 
 RUN apk --update --no-cache add \