diff --git a/cloudflare/proxy-latha-org/test_worker.mjs b/cloudflare/proxy-latha-org/test_worker.mjs
index 880e2ad..79100e5 100644
--- a/cloudflare/proxy-latha-org/test_worker.mjs
+++ b/cloudflare/proxy-latha-org/test_worker.mjs
@@ -89,6 +89,7 @@ async function testValidPushWebhook() {
   const bbBody = JSON.parse(calls.fetch[0].opts.body);
   assert.equal(bbBody.repo, "https://tangled.org/nandi.uk/sleek");
   assert.equal(bbBody.branch, "main");
+  assert.equal(bbBody.platform_properties.EstimatedFreeDiskBytes, "60GB");
   assert.match(bbBody.steps[0].run, /nix build \.#android/);
   assert.equal(calls.fetch[0].opts.headers["x-buildbuddy-api-key"], "test-bb-key");
 
diff --git a/cloudflare/proxy-latha-org/worker.js b/cloudflare/proxy-latha-org/worker.js
index 0a9e85e..64a8aa3 100644
--- a/cloudflare/proxy-latha-org/worker.js
+++ b/cloudflare/proxy-latha-org/worker.js
@@ -181,6 +181,13 @@ async function triggerBuild(env, cloneUrl, sha) {
   const body = {
     repo: cloneUrl,
     branch: "main",
+    // Default executor disk (~22G) isn't enough for a from-scratch build of
+    // this project (confirmed repeatedly: "No space left on device", even
+    // after fixing cache trust and clearing stale GC roots — the compile
+    // itself just needs more room than that). Confirmed directly that this
+    // property actually resizes the runner: a manual test with it reported
+    // `/dev/vda 63G` free vs. the ~22G default with it omitted.
+    platform_properties: { EstimatedFreeDiskBytes: "60GB" },
     steps: [{ run: buildScript(env, sha) }],
   };
   const resp = await fetch("https://app.buildbuddy.io/api/v1/Run", {