diff --git a/docker/Dockerfile.linux.amd64 b/docker/Dockerfile.linux.amd64
index 8dec631..7c28aa8 100644
--- a/docker/Dockerfile.linux.amd64
+++ b/docker/Dockerfile.linux.amd64
@@ -6,7 +6,7 @@ RUN tar -xf tmate-2.4.0-static-linux-amd64.tar.xz
 RUN mv tmate-2.4.0-static-linux-amd64/tmate /bin/
 RUN chmod +x /bin/tmate
 
-FROM alpine:3
+FROM --platform=linux/amd64 alpine:3
 EXPOSE 3000
 
 ENV GODEBUG netdns=go
diff --git a/docker/Dockerfile.linux.arm b/docker/Dockerfile.linux.arm
index 3f4d586..5350a34 100644
--- a/docker/Dockerfile.linux.arm
+++ b/docker/Dockerfile.linux.arm
@@ -6,7 +6,7 @@ RUN tar -xf tmate-2.4.0-static-linux-arm32v7.tar.xz
 RUN mv tmate-2.4.0-static-linux-arm32v7/tmate /bin/
 RUN chmod +x /bin/tmate
 
-FROM scratch
+FROM --platform=linux/arm scratch
 EXPOSE 3000
 
 ENV GODEBUG netdns=go
diff --git a/docker/Dockerfile.linux.arm64 b/docker/Dockerfile.linux.arm64
index 8e5b54e..c363572 100644
--- a/docker/Dockerfile.linux.arm64
+++ b/docker/Dockerfile.linux.arm64
@@ -6,7 +6,7 @@ RUN tar -xf tmate-2.4.0-static-linux-arm64v8.tar.xz
 RUN mv tmate-2.4.0-static-linux-arm64v8/tmate /bin/
 RUN chmod +x /bin/tmate
 
-FROM scratch
+FROM --platform=linux/arm64 scratch
 EXPOSE 3000
 
 ENV GODEBUG netdns=go
diff --git a/docker/Dockerfile.linux.ppc64le b/docker/Dockerfile.linux.ppc64le
index 52f515a..8144687 100644
--- a/docker/Dockerfile.linux.ppc64le
+++ b/docker/Dockerfile.linux.ppc64le
@@ -6,7 +6,7 @@ RUN tar -xf tmate-2.4.0-static-linux-ppc64le.tar.xz
 RUN mv tmate-2.4.0-static-linux-ppc64le/tmate /bin/
 RUN chmod +x /bin/tmate
 
-FROM scratch
+FROM --platform=linux/ppc64le scratch
 EXPOSE 3000
 
 ENV GODEBUG netdns=go