diff --git a/tutorials/multiphase/interFoam/RAS/DTCHull/0/U b/tutorials/multiphase/interFoam/RAS/DTCHull/0/U
index 224caaa29b..6aedda0111 100644
--- a/tutorials/multiphase/interFoam/RAS/DTCHull/0/U
+++ b/tutorials/multiphase/interFoam/RAS/DTCHull/0/U
@@ -16,11 +16,10 @@ FoamFile
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 Umean 1.668;
-mUmean -1.668;
 
 dimensions      [0 1 -1 0 0 0 0];
 
-internalField   uniform ($mUmean 0 0);
+internalField   uniform (#neg $Umean 0 0);
 
 boundaryField
 {
diff --git a/tutorials/multiphase/interFoam/RAS/DTCHullMoving/0/U b/tutorials/multiphase/interFoam/RAS/DTCHullMoving/0/U
index b17cb6b651..e7ccf9a4d8 100644
--- a/tutorials/multiphase/interFoam/RAS/DTCHullMoving/0/U
+++ b/tutorials/multiphase/interFoam/RAS/DTCHullMoving/0/U
@@ -16,11 +16,10 @@ FoamFile
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 Umean 1.668;
-mUmean -1.668;
 
 dimensions      [0 1 -1 0 0 0 0];
 
-internalField   uniform ($mUmean 0 0);
+internalField   uniform (#neg $Umean 0 0);
 
 boundaryField
 {
diff --git a/tutorials/multiphase/interFoam/RAS/DTCHullWave/0/U.orig b/tutorials/multiphase/interFoam/RAS/DTCHullWave/0/U.orig
index e8c323c709..4830e6dd92 100644
--- a/tutorials/multiphase/interFoam/RAS/DTCHullWave/0/U.orig
+++ b/tutorials/multiphase/interFoam/RAS/DTCHullWave/0/U.orig
@@ -16,11 +16,10 @@ FoamFile
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 Umean 1.668;
-mUmean -1.668;
 
 dimensions      [0 1 -1 0 0 0 0];
 
-internalField   uniform ($mUmean 0 0);
+internalField   uniform (#neg $Umean 0 0);
 
 boundaryField
 {