diff --git a/src/finiteVolume/cfdTools/general/porosityModel/DarcyForchheimer/DarcyForchheimer.C b/src/finiteVolume/cfdTools/general/porosityModel/DarcyForchheimer/DarcyForchheimer.C
index 4860c4849b..b0857fa78e 100644
--- a/src/finiteVolume/cfdTools/general/porosityModel/DarcyForchheimer/DarcyForchheimer.C
+++ b/src/finiteVolume/cfdTools/general/porosityModel/DarcyForchheimer/DarcyForchheimer.C
@@ -56,7 +56,7 @@ Foam::porosityModels::DarcyForchheimer::DarcyForchheimer
     D_("D", dimless/sqr(dimLength), tensor::zero),
     F_("F", dimless/dimLength, tensor::zero),
     rhoName_(coeffs_.lookupOrDefault<word>("rho", "rho")),
-    muName_(coeffs_.lookupOrDefault<word>("mu", "mu")),
+    muName_(coeffs_.lookupOrDefault<word>("mu", "thermo:mu")),
     nuName_(coeffs_.lookupOrDefault<word>("nu", "nu"))
 {
     // local-to-global transformation tensor
diff --git a/src/regionModels/surfaceFilmModels/kinematicSingleLayer/kinematicSingleLayer.C b/src/regionModels/surfaceFilmModels/kinematicSingleLayer/kinematicSingleLayer.C
index 9d053dc3de..d0a12c305c 100644
--- a/src/regionModels/surfaceFilmModels/kinematicSingleLayer/kinematicSingleLayer.C
+++ b/src/regionModels/surfaceFilmModels/kinematicSingleLayer/kinematicSingleLayer.C
@@ -765,7 +765,7 @@ kinematicSingleLayer::kinematicSingleLayer
     (
         IOobject
         (
-            "mu", // must have same name as mu to enable mapping
+            "thermo:mu", // must have same name as mu to enable mapping
             time().timeName(),
             regionMesh(),
             IOobject::NO_READ,