diff --git a/.github/workflows/selfhost.yml b/.github/workflows/selfhost.yml
index 68a07f3c7..f8ff53ee7 100644
--- a/.github/workflows/selfhost.yml
+++ b/.github/workflows/selfhost.yml
@@ -74,6 +74,15 @@ jobs:
       - name: Install deps
         run: npm ci --ignore-scripts
 
+      # Same #ci-engine-build-order fix as ci.yml (see its "Build engine package" step): the Postgres
+      # integration test's import graph now reaches @jsonbored/gittensory-engine transitively (#5117 moved
+      # local-write action specs there; src/mcp/local-write-tools.ts re-exports them). That package's
+      # dist/ is gitignored and only exists after this build step, so the test fails to resolve the
+      # package's exports without it -- this workflow never needed the engine package built before, so it
+      # never had this step; it does now.
+      - name: Build engine package
+        run: npm run build --workspace @jsonbored/gittensory-engine
+
       - name: Postgres integration test (real PG)
         run: PG_TEST_URL=postgres://postgres:devpw@localhost:5432/gittensory npx vitest run test/integration/selfhost-pg.test.ts