diff --git a/pyro/compressible/problems/inputs.convection b/pyro/compressible/problems/inputs.convection
index 150408310..b6bfff7f3 100644
--- a/pyro/compressible/problems/inputs.convection
+++ b/pyro/compressible/problems/inputs.convection
@@ -31,6 +31,9 @@ dens_cutoff = 1.e-3
 e_rate = 0.5
 
 
+[sponge]
+do_sponge = 1
+
 [compressible]
 grav = -2.0