diff --git a/docker-compose.debug.yaml b/docker-compose.debug.yaml
index 2c211b7..780d249 100644
--- a/docker-compose.debug.yaml
+++ b/docker-compose.debug.yaml
@@ -3,8 +3,11 @@ services:
     image: maestro
     container_name: maestro
     ports:
-      # Loopback-only default (dev is localhost anyway); see docker-compose.yaml
-      - "127.0.0.1:8080:8080"
+      # All interfaces: the debug stack is the instance a phone on the LAN
+      # talks to, and Maestro is the only port an app is ever given (the single
+      # data plane). Loopback-only makes the instance invisible to a device that
+      # is not using `adb reverse`. See docker-compose.yaml for the prod bind.
+      - "0.0.0.0:8080:8080"
     volumes:
       - "/var/run/docker.sock:/var/run/docker.sock"
       - "${XDG_DATA_HOME:-${HOME}}/.dcntrlized:/data/.dcntrlized"