diff --git a/example.ts b/example.ts
index a201bd7..8214378 100644
--- a/example.ts
+++ b/example.ts
@@ -1 +1,22 @@
-console.log('Some .ts code reproducing a bug');
+type Foo = {
+  foo: string,
+  bar: number,
+}
+
+function foofn () {
+  throw new Error('bar');
+}
+
+try {
+  foofn();
+}
+catch (err) {
+  const stack = (err as Error).stack || '';
+  if (/at foofn \(.*\/example\.ts:7:.*\)/.exec(stack)) {
+    console.log('OK, stack seems to have correct line numbers.');
+  }
+  else {
+    console.error('Grr, stack seems to have wrong line numbers.');
+    throw err;
+  }
+}
diff --git a/package.json b/package.json
index 4d56496..2bf5396 100644
--- a/package.json
+++ b/package.json
@@ -1,4 +1,5 @@
 {
+  "type": "module",
   "dependencies": {
     "ts-node": "latest",
     "typescript": "latest"
diff --git a/run.sh b/run.sh
index d553b44..7ee6026 100644
--- a/run.sh
+++ b/run.sh
@@ -1,13 +1,13 @@
 #!/usr/bin/env bash
 
 # Install a specific version of node
-n lts
+n v18.19.0
 
 # Install package.json dependencies
 yarn
 
 # Run ts-node
-yarn ts-node ./example.ts
+node --loader ts-node/esm/transpile-only ./example.ts
 
 echo "Process exited with code: $?"
 echo
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..0967ef4
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1 @@
+{}