diff --git a/src/OpenFOAM/meshes/primitiveMesh/PrimitivePatch/PrimitivePatch.H b/src/OpenFOAM/meshes/primitiveMesh/PrimitivePatch/PrimitivePatch.H
index e1dafb978c..2aaf0c8417 100644
--- a/src/OpenFOAM/meshes/primitiveMesh/PrimitivePatch/PrimitivePatch.H
+++ b/src/OpenFOAM/meshes/primitiveMesh/PrimitivePatch/PrimitivePatch.H
@@ -57,6 +57,7 @@ SourceFiles
 #include "point.H"
 #include "intersection.H"
 #include "HashSet.H"
+#include "objectHit.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
@@ -64,7 +65,6 @@ namespace Foam
 {
 
 class face;
-class objectHit;
 template<class T> class Map;
 
 /*---------------------------------------------------------------------------*\
diff --git a/src/OpenFOAM/meshes/primitiveShapes/objectHit/objectHit.H b/src/OpenFOAM/meshes/primitiveShapes/objectHit/objectHit.H
index 209c446309..61ee023ea3 100644
--- a/src/OpenFOAM/meshes/primitiveShapes/objectHit/objectHit.H
+++ b/src/OpenFOAM/meshes/primitiveShapes/objectHit/objectHit.H
@@ -43,9 +43,9 @@ namespace Foam
 // Forward declaration of friend functions and operators
 
 class objectHit;
-inline bool operator==(const objectHit& a, const objectHit& b);
-inline bool operator!=(const objectHit& a, const objectHit& b);
-inline Ostream& operator<<(Ostream& os, const objectHit& b);
+inline bool operator==(const objectHit&, const objectHit&);
+inline bool operator!=(const objectHit&, const objectHit&);
+inline Ostream& operator<<(Ostream&, const objectHit&);
 
 
 /*---------------------------------------------------------------------------*\
diff --git a/src/dynamicMesh/slidingInterface/enrichedPatch/enrichedPatch.H b/src/dynamicMesh/slidingInterface/enrichedPatch/enrichedPatch.H
index 1054b06a77..954061378d 100644
--- a/src/dynamicMesh/slidingInterface/enrichedPatch/enrichedPatch.H
+++ b/src/dynamicMesh/slidingInterface/enrichedPatch/enrichedPatch.H
@@ -61,8 +61,6 @@ SourceFiles
 namespace Foam
 {
 
-// Forward declaration of classes
-
 /*---------------------------------------------------------------------------*\
                           Class enrichedPatch Declaration
 \*---------------------------------------------------------------------------*/
diff --git a/src/dynamicMesh/slidingInterface/slidingInterface.H b/src/dynamicMesh/slidingInterface/slidingInterface.H
index 47f4bcfb57..7d2eb17d34 100644
--- a/src/dynamicMesh/slidingInterface/slidingInterface.H
+++ b/src/dynamicMesh/slidingInterface/slidingInterface.H
@@ -58,15 +58,13 @@ SourceFiles
 #include "ZoneIDs.H"
 #include "intersection.H"
 #include "Pair.H"
+#include "objectHit.H"
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
 namespace Foam
 {
 
-// Forward declaration of classes
-class objectHit;
-
 /*---------------------------------------------------------------------------*\
                       Class slidingInterface Declaration
 \*---------------------------------------------------------------------------*/