diff --git a/applications/solvers/compressible/rhoPimpleFoam/rhoPorousMRFPimpleFoam/UEqn.H b/applications/solvers/compressible/rhoPimpleFoam/rhoPorousMRFPimpleFoam/UEqn.H
index 2a9b92d9f0..4efb76bd45 100644
--- a/applications/solvers/compressible/rhoPimpleFoam/rhoPorousMRFPimpleFoam/UEqn.H
+++ b/applications/solvers/compressible/rhoPimpleFoam/rhoPorousMRFPimpleFoam/UEqn.H
@@ -3,7 +3,7 @@
 tmp<fvVectorMatrix> UEqn
 (
     //pZones.ddt(rho, U)
-    fvc::ddt(rho, U)
+    fvm::ddt(rho, U)
   + fvm::div(phi, U)
   + turbulence->divDevRhoReff(U)
 );
diff --git a/applications/solvers/multiphase/interFoam/porousInterFoam/UEqn.H b/applications/solvers/multiphase/interFoam/porousInterFoam/UEqn.H
index 246a79d3c9..72ae38ba06 100644
--- a/applications/solvers/multiphase/interFoam/porousInterFoam/UEqn.H
+++ b/applications/solvers/multiphase/interFoam/porousInterFoam/UEqn.H
@@ -11,7 +11,7 @@
     fvVectorMatrix UEqn
     (
         //pZones.ddt(rho, U)
-        fvc::ddt(rho, U)
+        fvm::ddt(rho, U)
       + fvm::div(rhoPhi, U)
       - fvm::laplacian(muEff, U)
       - (fvc::grad(U) & fvc::grad(muEff))