diff --git a/autoware_launch/config/control/control_validator/control_validator.param.yaml b/autoware_launch/config/control/control_validator/control_validator.param.yaml
index c51cbafba2..ffd259e5e5 100644
--- a/autoware_launch/config/control/control_validator/control_validator.param.yaml
+++ b/autoware_launch/config/control/control_validator/control_validator.param.yaml
@@ -1,8 +1,6 @@
 /**:
   ros__parameters:
 
-    publish_diag: false  # if true, diagnostic msg is published
-
     # If the number of consecutive invalid predicted_path exceeds this threshold, the Diag will be set to ERROR.
     # (For example, threshold = 1 means, even if the predicted_path is invalid, Diag will not be ERROR if
     #  the next predicted_path is valid.)