diff --git a/labs/otel-in-action/collector/otel-collector-config.yml b/labs/otel-in-action/collector/otel-collector-config.yml
index b3505bc..f605907 100644
--- a/labs/otel-in-action/collector/otel-collector-config.yml
+++ b/labs/otel-in-action/collector/otel-collector-config.yml
@@ -2,6 +2,7 @@ receivers:
   otlp:
     protocols:
       grpc:
+        endpoint: 0.0.0.0:4317
 
 exporters:
   debug: