diff --git a/Dockerfile b/Dockerfile
index afd50e8..4928ee2 100755
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,7 +9,7 @@ LABEL maintainer="aptalca"
 
 # environment settings
 ENV DHLEVEL=2048 ONLY_SUBDOMAINS=false AWS_CONFIG_FILE=/config/dns-conf/route53.ini
-ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2 CRYPTOGRAPHY_DONT_BUILD_RUST=true
+ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2
 
 RUN \
  echo "**** install build packages ****" && \
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 5aa488e..e57d2b2 100755
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -9,7 +9,7 @@ LABEL maintainer="aptalca"
 
 # environment settings
 ENV DHLEVEL=2048 ONLY_SUBDOMAINS=false AWS_CONFIG_FILE=/config/dns-conf/route53.ini
-ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2 CRYPTOGRAPHY_DONT_BUILD_RUST=true
+ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2
 
 RUN \
  echo "**** install build packages ****" && \
diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index 1b194bb..681d520 100755
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -9,7 +9,7 @@ LABEL maintainer="aptalca"
 
 # environment settings
 ENV DHLEVEL=2048 ONLY_SUBDOMAINS=false AWS_CONFIG_FILE=/config/dns-conf/route53.ini
-ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2 CRYPTOGRAPHY_DONT_BUILD_RUST=true
+ENV S6_BEHAVIOUR_IF_STAGE2_FAILS=2
 
 RUN \
  echo "**** install build packages ****" && \