diff --git a/Dockerfile b/Dockerfile
index 571c5c2..4918ed9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -24,7 +24,6 @@ RUN rm -rf /app/usr/local/lib/python${PYTHON_VERSION%.*}/test
 RUN chown -R nobody:nobody /app/conf
 
 FROM alpine:edge
-ARG CRYPTOGRAPHY_OPENSSL_NO_LEGACY=1
 WORKDIR /app
 RUN apk add --no-cache libgcc libffi-dev gcompat su-exec
 USER 0:0
diff --git a/entrypoint.sh b/entrypoint.sh
index bb2cc22..7c7dde5 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -1,5 +1,6 @@
 #!/bin/ash
 set -e
 export LD_PRELOAD=libgcompat.so.0
+export CRYPTOGRAPHY_OPENSSL_NO_LEGACY=1
 su-exec 0:0 /app/bin/authproxy_connectivity_tool
 su-exec 0:0 /app/bin/authproxy