diff --git a/tutorials/compressible/rhoPimpleFoam/ras/mixerVessel2D/system/fvOptions b/tutorials/compressible/rhoPimpleFoam/ras/mixerVessel2D/system/fvOptions
index 0a7bb92252..ef7041a462 100644
--- a/tutorials/compressible/rhoPimpleFoam/ras/mixerVessel2D/system/fvOptions
+++ b/tutorials/compressible/rhoPimpleFoam/ras/mixerVessel2D/system/fvOptions
@@ -31,13 +31,16 @@ porosity1
             d   d [0 -2 0 0 0 0 0] (1e5 -1000 -1000);
             f   f [0 -1 0 0 0 0 0] (0 0 0);
 
-            type    cartesian;
-            origin  (0 0 0);
-            coordinateRotation
+            coordinateSystem
             {
-                type    axesRotation;
-                e1  (1 0 0);
-                e2  (0 1 0);
+                type    cartesian;
+                origin  (0 0 0);
+                coordinateRotation
+                {
+                    type    axesRotation;
+                    e1  (1 0 0);
+                    e2  (0 1 0);
+                }
             }
         }
     }