diff --git a/ocean/input.nml b/ocean/input.nml
index de78894..b6ecb87 100644
--- a/ocean/input.nml
+++ b/ocean/input.nml
@@ -464,6 +464,7 @@
 /
 
 &ocean_topog_nml
+    min_thickness = 1.0e-3
 /
 
 &ocean_tracer_advect_nml