diff --git a/ocean/input.nml b/ocean/input.nml
index ecc177e..b9ae0da 100644
--- a/ocean/input.nml
+++ b/ocean/input.nml
@@ -466,7 +466,7 @@
 /
 
  &ocean_topog_nml
-
+     min_thickness = 1.0e-3
 /
 
  &ocean_tracer_advect_nml