diff --git a/applications/solvers/multiphase/driftFluxFoam/wallViscosity.H b/applications/solvers/multiphase/driftFluxFoam/wallViscosity.H
index d73e0a5d1d..b75db346f5 100644
--- a/applications/solvers/multiphase/driftFluxFoam/wallViscosity.H
+++ b/applications/solvers/multiphase/driftFluxFoam/wallViscosity.H
@@ -20,7 +20,7 @@
 
                 scalar yPlus =
                     Cmu25*y[patchi][facei]*::sqrt(k[faceCelli])
-                   /(mulw[facei]/rho2.value());
+                   /(mulw[facei]/rho[facei]);
 
                 if (yPlus > 11.6)
                 {