diff --git a/scripts/deploy-selfhost-prebuilt.sh b/scripts/deploy-selfhost-prebuilt.sh
index 484c29aadb..0718ea169f 100755
--- a/scripts/deploy-selfhost-prebuilt.sh
+++ b/scripts/deploy-selfhost-prebuilt.sh
@@ -35,7 +35,7 @@ run_node_build() {
     -v "$PWD:/work" \
     -w /work \
     "$NODE_IMAGE" \
-    sh -lc 'npm ci --ignore-scripts && node scripts/build-selfhost.mjs --all && node scripts/validate-selfhost-sourcemap.mjs'
+    sh -lc 'npm ci --ignore-scripts && npm --workspace @jsonbored/gittensory-engine run build && node scripts/build-selfhost.mjs --all && node scripts/validate-selfhost-sourcemap.mjs'
 }
 
 run_sentry_upload() {
diff --git a/test/unit/docs-selfhost-update-rollback.test.ts b/test/unit/docs-selfhost-update-rollback.test.ts
index 00a9fed397..b3fc8b155d 100644
--- a/test/unit/docs-selfhost-update-rollback.test.ts
+++ b/test/unit/docs-selfhost-update-rollback.test.ts
@@ -32,6 +32,17 @@ describe("self-host update + rollback docs (#1823)", () => {
     expect(prebuiltScript).toContain('up -d --no-deps "$SERVICE"');
   });
 
+  it("prebuilt deploy builds the gittensory-engine workspace before bundling (#4530)", () => {
+    // packages/gittensory-engine/dist/ is gitignored and built via `tsc`; `npm ci --ignore-scripts`
+    // never triggers that build on its own, so anything that imports the engine (e.g.
+    // packages/gittensory-miner) fails to resolve during the --all bundle unless this runs first.
+    const engineBuildIndex = prebuiltScript.indexOf("@jsonbored/gittensory-engine run build");
+    const bundleIndex = prebuiltScript.indexOf("build-selfhost.mjs --all");
+    expect(engineBuildIndex).toBeGreaterThan(-1);
+    expect(bundleIndex).toBeGreaterThan(-1);
+    expect(engineBuildIndex).toBeLessThan(bundleIndex);
+  });
+
   it("post-update script probes /ready without mutating operator-owned state", () => {
     expect(postUpdateScript).toContain("/ready");
     expect(postUpdateScript).toContain("GITTENSORY_IMAGE");