diff --git a/Dockerfile b/Dockerfile
index 2a70f17d..f795a86b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -64,6 +64,7 @@ RUN cargo build --release
 FROM debian:stretch-slim
 
 ENV ROCKET_ENV "staging"
+ENV ROCKET_PORT=80
 ENV ROCKET_WORKERS=10
 
 # Install needed libraries
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 77bea2d3..2eb68221 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -83,6 +83,7 @@ RUN cargo build --release --target=aarch64-unknown-linux-gnu -v
 FROM resin/aarch64-debian:stretch
 
 ENV ROCKET_ENV "staging"
+ENV ROCKET_PORT=80
 ENV ROCKET_WORKERS=10
 
 RUN [ "cross-build-start" ]
diff --git a/Dockerfile.alpine b/Dockerfile.alpine
index edcfd59a..03cc09d2 100644
--- a/Dockerfile.alpine
+++ b/Dockerfile.alpine
@@ -56,6 +56,7 @@ RUN cargo build --release
 FROM alpine:3.8
 
 ENV ROCKET_ENV "staging"
+ENV ROCKET_PORT=80
 ENV ROCKET_WORKERS=10
 ENV SSL_CERT_DIR=/etc/ssl/certs
 
diff --git a/Dockerfile.armv7 b/Dockerfile.armv7
index 2712ae65..e6348297 100644
--- a/Dockerfile.armv7
+++ b/Dockerfile.armv7
@@ -83,6 +83,7 @@ RUN cargo build --release --target=armv7-unknown-linux-gnueabihf -v
 FROM resin/armv7hf-debian:stretch
 
 ENV ROCKET_ENV "staging"
+ENV ROCKET_PORT=80
 ENV ROCKET_WORKERS=10
 
 RUN [ "cross-build-start" ]