diff --git a/README.md b/README.md
index 3726addd..3c50aced 100644
--- a/README.md
+++ b/README.md
@@ -402,6 +402,23 @@ await exec(['app.js', '--target', 'host', '--output', 'app.exe']);
 
 ## Troubleshooting
 
+### Error: Cannot find module XXX (when using `child_process`)
+
+When using `child_process` methods to run a new process pkg by default will invoke it using NodeJS runtime that is built into the executable. This means that if you are trying to spawn the packaged app itself you will get above error. In order to avoid this you must set `PKG_EXECPATH` env set to `""`:
+
+```js
+const { spawn } = require('child_process');
+
+const child = spawn(process.execPath, [process.argv[1]], {
+  env: {
+    ...process.env,
+    PKG_EXECPATH: '',
+  },
+});
+```
+
+More info [here](https://github.com/yao-pkg/pkg/pull/90)
+
 ### Error: ENOENT: no such file or directory, uv_chdir
 
 This error can be caused by deleting the directory the application is
diff --git a/prelude/bootstrap.js b/prelude/bootstrap.js
index fa654071..c775c92b 100644
--- a/prelude/bootstrap.js
+++ b/prelude/bootstrap.js
@@ -2006,7 +2006,8 @@ function payloadFileSync(pointer) {
     }
     const opts = args[pos];
     if (!opts.env) opts.env = _extend({}, process.env);
-    if (opts.env.PKG_EXECPATH === 'PKG_INVOKE_NODEJS') return;
+    // see https://github.com/vercel/pkg/issues/897#issuecomment-1049370335
+    if (opts.env.PKG_EXECPATH !== undefined) return;
     opts.env.PKG_EXECPATH = EXECPATH;
   }