diff --git a/src/SimNDT/run_setup/runSimulator.py b/src/SimNDT/run_setup/runSimulator.py
index 22a6037..1c43d25 100644
--- a/src/SimNDT/run_setup/runSimulator.py
+++ b/src/SimNDT/run_setup/runSimulator.py
@@ -162,7 +162,7 @@ def read_materials(sim_params,Library):
             if "Eta_v" in sim_params["Materials"][mat_num]:
               mat_eta_v = sim_params["Materials"][mat_num]["Eta_v"]
               mat_eta_s = sim_params["Materials"][mat_num]["Eta_s"]
-              mat_damping = sim_params["Materials"][mat_num]["Damping"]
+              mat_damping = True
             else:
               mat_damping = False
               mat_eta_v = 1e-30