diff --git a/tutorials/multiphase/interDyMFoam/ras/motorBike/system/setFieldsDict b/tutorials/multiphase/interDyMFoam/ras/motorBike/system/setFieldsDict
index c7cd093635..07a8dc3c4a 100644
--- a/tutorials/multiphase/interDyMFoam/ras/motorBike/system/setFieldsDict
+++ b/tutorials/multiphase/interDyMFoam/ras/motorBike/system/setFieldsDict
@@ -26,7 +26,8 @@ regions
     boxToCell
     {
         //box ( -1 -0.5 0 ) ( -0.5 0.5 2 );
-        box ( -1 -0.5 1.5 ) ( 3 0.5 2 );
+        //box ( -0.5 -0.5 1.5 ) ( 1.5 0.5 2 );
+        box ( 0 -0.5 1.5 ) ( 2 0.5 1.75 );
         fieldValues
         (
             volScalarFieldValue alpha.water 1