diff --git a/dist/index.js b/dist/index.js
index ca60af0..9fe91b1 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -12181,11 +12181,12 @@ async function setUpAutoCache() {
     else {
         runEnv = process.env;
     }
-    // Start the server.
+    // Start the server. Once it is ready, it will notify us via file descriptor 3.
     const outputPath = `${daemonDir}/daemon.log`;
     const output = openSync(outputPath, 'a');
+    const notifyFd = 3;
     const daemon = spawn(daemonBin, [
-        '--notify-fd', '3',
+        '--notify-fd', String(notifyFd),
         '--listen', coreExports.getInput('listen'),
         '--upstream', coreExports.getInput('upstream-cache'),
         '--diagnostic-endpoint', coreExports.getInput('diagnostic-endpoint'),
@@ -12205,7 +12206,7 @@ async function setUpAutoCache() {
     const pidFile = path$1.join(daemonDir, 'daemon.pid');
     await fs$2.writeFile(pidFile, `${daemon.pid}`);
     await new Promise((resolve, reject) => {
-        daemon.stdio[3].on('data', (data) => {
+        daemon.stdio[notifyFd].on('data', (data) => {
             if (data.toString().trim() == 'INIT') {
                 resolve();
             }
@@ -12233,7 +12234,6 @@ async function notifyAutoCache() {
         return;
     }
     try {
-        // FIXME: remove this
         coreExports.debug(`Indicating workflow start`);
         const res = await gotClient.post(`http://${coreExports.getInput('listen')}/api/workflow-start`).json();
         coreExports.debug(`back from post`);
diff --git a/src/index.ts b/src/index.ts
index 5aad26d..79ade61 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -113,13 +113,14 @@ async function setUpAutoCache() {
     runEnv = process.env;
   }
 
-  // Start the server.
+  // Start the server. Once it is ready, it will notify us via file descriptor 3.
   const outputPath = `${daemonDir}/daemon.log`;
   const output = openSync(outputPath, 'a');
+  const notifyFd = 3;
   const daemon = spawn(
     daemonBin,
     [
-      '--notify-fd', '3',
+      '--notify-fd', String(notifyFd),
       '--listen', core.getInput('listen'),
       '--upstream', core.getInput('upstream-cache'),
       '--diagnostic-endpoint', core.getInput('diagnostic-endpoint'),
@@ -145,7 +146,7 @@ async function setUpAutoCache() {
   await fs.writeFile(pidFile, `${daemon.pid}`);
 
   await new Promise<void>((resolve, reject) => {
-    daemon.stdio[3].on('data', (data) => {
+    daemon.stdio[notifyFd].on('data', (data) => {
       if (data.toString().trim() == 'INIT') {
         resolve();
       }
@@ -177,7 +178,6 @@ async function notifyAutoCache() {
   }
 
   try {
-    // FIXME: remove this
     core.debug(`Indicating workflow start`);
     const res: any = await gotClient.post(`http://${core.getInput('listen')}/api/workflow-start`).json();
     core.debug(`back from post`);