diff --git a/Dockerfile b/Dockerfile
index 4196fca80..51908346d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,8 +10,8 @@ COPY . .
 RUN make build TAGS="cert pam"
 
 FROM alpine:3.11
-ADD https://github.com/tianon/gosu/releases/download/1.11/gosu-amd64 /usr/sbin/gosu
-RUN chmod +x /usr/sbin/gosu \
+RUN wget https://github.com/tianon/gosu/releases/download/1.11/gosu-amd64 -O /usr/sbin/gosu \
+  && chmod +x /usr/sbin/gosu \
   && echo http://dl-2.alpinelinux.org/alpine/edge/community/ >> /etc/apk/repositories \
   && apk --no-cache --no-progress add \
   bash \
diff --git a/docker/Dockerfile.aarch64 b/docker/Dockerfile.aarch64
index f06372997..d69916899 100644
--- a/docker/Dockerfile.aarch64
+++ b/docker/Dockerfile.aarch64
@@ -10,8 +10,8 @@ COPY . .
 RUN make build TAGS="cert pam"
 
 FROM arm64v8/alpine:3.11
-ADD https://github.com/tianon/gosu/releases/download/1.11/gosu-arm64 /usr/sbin/gosu
-RUN chmod +x /usr/sbin/gosu \
+RUN wget https://github.com/tianon/gosu/releases/download/1.11/gosu-arm64 -O /usr/sbin/gosu \
+  && chmod +x /usr/sbin/gosu \
   && echo http://dl-2.alpinelinux.org/alpine/edge/community/ >> /etc/apk/repositories \
   && apk --no-cache --no-progress add \
   bash \
diff --git a/docker/Dockerfile.rpi b/docker/Dockerfile.rpi
index 41560145a..8e0b41f43 100644
--- a/docker/Dockerfile.rpi
+++ b/docker/Dockerfile.rpi
@@ -10,8 +10,8 @@ COPY . .
 RUN make build TAGS="cert pam"
 
 FROM arm32v7/alpine:3.12
-ADD https://github.com/tianon/gosu/releases/download/1.12/gosu-armhf /usr/sbin/gosu
-RUN chmod +x /usr/sbin/gosu \
+RUN wget https://github.com/tianon/gosu/releases/download/1.12/gosu-armhf -O /usr/sbin/gosu \
+  && chmod +x /usr/sbin/gosu \
   && echo http://dl-2.alpinelinux.org/alpine/edge/community/ >> /etc/apk/repositories \
   && apk --no-cache --no-progress add \
   bash \