diff --git a/src/OpenFOAM/matrices/lduMatrix/lduMatrix/lduMatrix.C b/src/OpenFOAM/matrices/lduMatrix/lduMatrix/lduMatrix.C
index 0ecf015fd4..3ebbdb5c63 100644
--- a/src/OpenFOAM/matrices/lduMatrix/lduMatrix/lduMatrix.C
+++ b/src/OpenFOAM/matrices/lduMatrix/lduMatrix/lduMatrix.C
@@ -41,6 +41,8 @@ namespace Foam
 }
 
 
+const Foam::scalar Foam::lduMatrix::defaultTolerance = 1e-6;
+
 const Foam::Enum
 <
     Foam::lduMatrix::normTypes
diff --git a/src/OpenFOAM/matrices/lduMatrix/lduMatrix/lduMatrix.H b/src/OpenFOAM/matrices/lduMatrix/lduMatrix/lduMatrix.H
index 6ebb028e56..3c5e88d714 100644
--- a/src/OpenFOAM/matrices/lduMatrix/lduMatrix/lduMatrix.H
+++ b/src/OpenFOAM/matrices/lduMatrix/lduMatrix/lduMatrix.H
@@ -108,11 +108,11 @@ public:
         //- Names for the normTypes
         static const Enum<normTypes> normTypesNames_;
 
-        //- Default maximum number of iterations for solvers
-        static constexpr label defaultMaxIter = 1000;
+        //- Default maximum number of iterations for solvers (1000)
+        static constexpr const label defaultMaxIter = 1000;
 
-        //- Default (absolute) tolerance
-        static constexpr scalar defaultTolerance = 1e-6;
+        //- Default (absolute) tolerance (1e-6)
+        static const scalar defaultTolerance;
 
 
     //- Abstract base-class for lduMatrix solvers