diff --git a/tutorials/multiphase/interFoam/RAS/waterChannel/system/controlDict b/tutorials/multiphase/interFoam/RAS/waterChannel/system/controlDict
index fb23b4773c..00d32294de 100644
--- a/tutorials/multiphase/interFoam/RAS/waterChannel/system/controlDict
+++ b/tutorials/multiphase/interFoam/RAS/waterChannel/system/controlDict
@@ -66,8 +66,10 @@ functions
 
         fields
         (
-            rhoPhi
+            phi
         );
+
+        weightField     alpha.water;
     }
 
     outletFlux