diff --git a/.forgejo/workflows/lint-and-build.yml b/.forgejo/workflows/lint-and-build.yml
index ea85199..61e15be 100644
--- a/.forgejo/workflows/lint-and-build.yml
+++ b/.forgejo/workflows/lint-and-build.yml
@@ -111,12 +111,8 @@ jobs:
         image: mongo:7
         env:
           MONGO_INITDB_DATABASE: normogen_test
-        # No `ports:` mapping: the job container reaches Mongo over the job's
-        # internal network via the service hostname (MONGODB_URI uses `mongo`,
-        # not localhost). Publishing to a host port is unnecessary and collides
-        # with any mongod already bound to :27017 on the runner host — which
-        # made the service container fail to schedule ("port is already
-        # allocated") and aborted the whole test job before any test ran.
+        ports:
+          - 27017:27017
     env:
       MONGODB_URI: mongodb://mongo:27017
       APP_ENVIRONMENT: development