diff --git a/tutorials/heatTransfer/buoyantBoussinesqSimpleFoam/iglooWithFridges/system/decomposeParDict b/tutorials/heatTransfer/buoyantBoussinesqSimpleFoam/iglooWithFridges/system/decomposeParDict
index 5a7e0bb079..d9fdbcd5fa 100644
--- a/tutorials/heatTransfer/buoyantBoussinesqSimpleFoam/iglooWithFridges/system/decomposeParDict
+++ b/tutorials/heatTransfer/buoyantBoussinesqSimpleFoam/iglooWithFridges/system/decomposeParDict
@@ -14,6 +14,8 @@ FoamFile
 }
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+numberOfSubdomains 2;
+
 method             scotch;