diff --git a/src/OpenFOAM/matrices/lduMatrix/lduMatrix/lduMatrix.C b/src/OpenFOAM/matrices/lduMatrix/lduMatrix/lduMatrix.C
index 69a01236c13dec57bed519acca9c52902a8f1ffe..22e9fb2f6cd5c02a2638bde05712bdd5f59051a8 100644
--- a/src/OpenFOAM/matrices/lduMatrix/lduMatrix/lduMatrix.C
+++ b/src/OpenFOAM/matrices/lduMatrix/lduMatrix/lduMatrix.C
@@ -119,7 +119,10 @@ Foam::lduMatrix::lduMatrix(lduMatrix& A, bool reUse)
 
 Foam::lduMatrix::lduMatrix(const lduMesh& mesh, Istream& is)
 :
-    lduMesh_(mesh)
+    lduMesh_(mesh),
+    lowerPtr_(NULL),
+    diagPtr_(NULL),
+    upperPtr_(NULL)
 {
     Switch hasLow(is);
     Switch hasDiag(is);