diff --git a/applications/solvers/compressible/rhoPimpleFoam/overRhoPimpleDyMFoam/pEqn.H b/applications/solvers/compressible/rhoPimpleFoam/overRhoPimpleDyMFoam/pEqn.H
index ba9cbf752c..ec31872e6d 100644
--- a/applications/solvers/compressible/rhoPimpleFoam/overRhoPimpleDyMFoam/pEqn.H
+++ b/applications/solvers/compressible/rhoPimpleFoam/overRhoPimpleDyMFoam/pEqn.H
@@ -8,7 +8,7 @@ surfaceScalarField faceMask(localMin<scalar>(mesh).interpolate(cellMask));
 volScalarField rAU(1.0/UEqn.A());
 surfaceScalarField rhorAUf("rhorAUf", faceMask*fvc::interpolate(rho*rAU));
 volVectorField HbyA("HbyA", U);
-HbyA = constrainHbyA(rAU*UEqn.H(), U, p);
+HbyA = constrainHbyA(cellMask*rAU*UEqn.H(), U, p);
 
 if (pimple.nCorrPISO() <= 1)
 {