diff --git a/Dockerfile b/Dockerfile
index 2c4838a..b4e3d51 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -57,5 +57,5 @@ COPY --from=buildstage /tmp/sync/syncthing /usr/bin/
 COPY root/ /
 
 # ports and volumes
-EXPOSE 8384 22000 21027/UDP
+EXPOSE 8384 22000/tcp 22000/udp 21027/UDP
 VOLUME /config
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index bd28a57..6234ae4 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -57,5 +57,5 @@ COPY --from=buildstage /tmp/sync/syncthing /usr/bin/
 COPY root/ /
 
 # ports and volumes
-EXPOSE 8384 22000 21027/UDP
+EXPOSE 8384 22000/tcp 22000/udp 21027/UDP
 VOLUME /config
diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index 390f0d1..eec20ca 100644
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -57,5 +57,5 @@ COPY --from=buildstage /tmp/sync/syncthing /usr/bin/
 COPY root/ /
 
 # ports and volumes
-EXPOSE 8384 22000 21027/UDP
+EXPOSE 8384 22000/tcp 22000/udp 21027/UDP
 VOLUME /config