diff --git a/usv_gazebo_plugins/src/usv_gazebo_dynamics_plugin.cc b/usv_gazebo_plugins/src/usv_gazebo_dynamics_plugin.cc
index 05aae52bc..a6877479b 100644
--- a/usv_gazebo_plugins/src/usv_gazebo_dynamics_plugin.cc
+++ b/usv_gazebo_plugins/src/usv_gazebo_dynamics_plugin.cc
@@ -336,7 +336,7 @@ void UsvDynamicsPlugin::Update()
       }
 
       // Vertical wave displacement.
-      double dz = depth + X.Z();
+      double dz = depth;
 
       // Total z location of boat grid point relative to water surface
       double  deltaZ = (this->waterLevel + dz) - kDdz;