diff --git a/happypose_ros/happypose_ros/happypose_ros_parameters.yaml b/happypose_ros/happypose_ros/happypose_ros_parameters.yaml
index cecae97..80f46fa 100644
--- a/happypose_ros/happypose_ros/happypose_ros_parameters.yaml
+++ b/happypose_ros/happypose_ros/happypose_ros_parameters.yaml
@@ -193,5 +193,8 @@ happypose_ros:
         type: double,
         default_value: 0.04,
         description: "Delay [seconds] with which incoming messages can be synchronized.",
+        validation: {
+          gt<>: [0.0],
+        },
         read_only: true
       }