diff --git a/.env.example b/.env.example
index 5c0a9ae..a52af0b 100644
--- a/.env.example
+++ b/.env.example
@@ -23,6 +23,9 @@ APP_URL=https://synth.example.com
 # Port for the backend HTTP server (inside the container).
 PORT=8080
 
+# Port for the backend HTTP server (outside the container).
+EXT_PORT=8005
+
 # Logging level. Options: error, warn, info, debug, trace.
 # Format: "level" or "level,crate=level"
 RUST_LOG=info,ai_synth_backend=debug
diff --git a/docker-compose.yml b/docker-compose.yml
index 0fcf624..2d2ff9e 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -15,7 +15,7 @@ services:
     networks:
       - internal
     ports:
-      - "127.0.0.1:${PORT:-8005}:8080"
+      - "127.0.0.1:${EXT_PORT:-8005}:8080"
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:8080/api/v1/health"]
       interval: 30s