diff --git a/docs/tutorials/setup-opentelemetry.md b/docs/tutorials/setup-opentelemetry.md
index 3d7cb4bb4b..cc4eed15a5 100644
--- a/docs/tutorials/setup-opentelemetry.md
+++ b/docs/tutorials/setup-opentelemetry.md
@@ -27,6 +27,11 @@ yarn --cwd packages/backend add \
 In your `packages/backend/src` folder, create an `instrumentation.js` file.
 
 ```typescript title="in packages/backend/src/instrumentation.js"
+// Prevent from running more than once (due to worker threads)
+if (!require('node:worker_threads').isMainThread) {
+  return;
+}
+
 const { NodeSDK } = require('@opentelemetry/sdk-node');
 const {
   getNodeAutoInstrumentations,
diff --git a/packages/backend/src/instrumentation.js b/packages/backend/src/instrumentation.js
index e3725632c1..ac2f292c27 100644
--- a/packages/backend/src/instrumentation.js
+++ b/packages/backend/src/instrumentation.js
@@ -14,6 +14,11 @@
  * limitations under the License.
  */
 
+// Prevent from running more than once (due to worker threads)
+if (!require('node:worker_threads').isMainThread) {
+  return;
+}
+
 const { NodeSDK } = require('@opentelemetry/sdk-node');
 const {
   getNodeAutoInstrumentations,