diff --git a/src/underworld3/systems/ddt.py b/src/underworld3/systems/ddt.py
index 39bf5692..bda85a8a 100644
--- a/src/underworld3/systems/ddt.py
+++ b/src/underworld3/systems/ddt.py
@@ -2262,7 +2262,7 @@ def __init__(
         super().__init__()
 
         # create a new swarm to manage here
-        dudt_swarm = uw.swarm.UWSwarm(mesh)
+        dudt_swarm = uw.swarm.Swarm(mesh)
 
         self.mesh = mesh
         self.swarm = dudt_swarm