diff --git a/src/finiteVolume/cfdTools/general/MRF/MRFZoneList.C b/src/finiteVolume/cfdTools/general/MRF/MRFZoneList.C
index e1d2a1f11e..9d111be380 100644
--- a/src/finiteVolume/cfdTools/general/MRF/MRFZoneList.C
+++ b/src/finiteVolume/cfdTools/general/MRF/MRFZoneList.C
@@ -39,7 +39,7 @@ Foam::MRFZoneList::MRFZoneList
 {
     reset(dict);
 
-    active();
+    active(true);
 }
 
 
@@ -51,7 +51,7 @@ Foam::MRFZoneList::~MRFZoneList()
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-bool Foam::MRFZoneList::active() const
+bool Foam::MRFZoneList::active(const bool warn) const
 {
     bool a = false;
     forAll(*this, i)
@@ -59,7 +59,7 @@ bool Foam::MRFZoneList::active() const
         a = a || this->operator[](i).active();
     }
 
-    if (!a)
+    if (warn && this->size() && !a)
     {
         Info<< "    No MRF zones active" << endl;
     }
diff --git a/src/finiteVolume/cfdTools/general/MRF/MRFZoneList.H b/src/finiteVolume/cfdTools/general/MRF/MRFZoneList.H
index e956f6e0e0..a2311c52c8 100644
--- a/src/finiteVolume/cfdTools/general/MRF/MRFZoneList.H
+++ b/src/finiteVolume/cfdTools/general/MRF/MRFZoneList.H
@@ -88,7 +88,7 @@ public:
     // Member Functions
 
         //- Return active status
-        bool active() const;
+        bool active(const bool warn = false) const;
 
         //- Reset the source list
         void reset(const dictionary& dict);
diff --git a/src/finiteVolume/cfdTools/general/porosityModel/porosityModel/porosityModelList.C b/src/finiteVolume/cfdTools/general/porosityModel/porosityModel/porosityModelList.C
index 9cccc1f7f4..df3028547c 100644
--- a/src/finiteVolume/cfdTools/general/porosityModel/porosityModel/porosityModelList.C
+++ b/src/finiteVolume/cfdTools/general/porosityModel/porosityModel/porosityModelList.C
@@ -38,6 +38,8 @@ Foam::porosityModelList::porosityModelList
     mesh_(mesh)
 {
     reset(dict);
+
+    active(true);
 }
 
 
@@ -49,7 +51,7 @@ Foam::porosityModelList::~porosityModelList()
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-bool Foam::porosityModelList::active() const
+bool Foam::porosityModelList::active(const bool warn) const
 {
     bool a = false;
     forAll(*this, i)
@@ -57,7 +59,7 @@ bool Foam::porosityModelList::active() const
         a = a || this->operator[](i).active();
     }
 
-    if (!a)
+    if (warn && this->size() && !a)
     {
         Info<< "No porosity models active" << endl;
     }
diff --git a/src/finiteVolume/cfdTools/general/porosityModel/porosityModel/porosityModelList.H b/src/finiteVolume/cfdTools/general/porosityModel/porosityModel/porosityModelList.H
index e580a2d0fa..3d0d015923 100644
--- a/src/finiteVolume/cfdTools/general/porosityModel/porosityModel/porosityModelList.H
+++ b/src/finiteVolume/cfdTools/general/porosityModel/porosityModel/porosityModelList.H
@@ -88,7 +88,7 @@ public:
     // Member Functions
 
         //- Return active status
-        bool active() const;
+        bool active(const bool active = false) const;
 
         //- Reset the source list
         void reset(const dictionary& dict);