diff --git a/src/mesh/snappyHexMesh/snappyHexMeshDriver/snappyLayerDriver.C b/src/mesh/snappyHexMesh/snappyHexMeshDriver/snappyLayerDriver.C
index 072e39dfeb96c22a7959ab2b334a190725f972d3..94365fc3670a0a13d312ce33efedc8447a85ebcb 100644
--- a/src/mesh/snappyHexMesh/snappyHexMeshDriver/snappyLayerDriver.C
+++ b/src/mesh/snappyHexMesh/snappyHexMeshDriver/snappyLayerDriver.C
@@ -4919,9 +4919,9 @@ void Foam::snappyLayerDriver::addLayers
 
 
     // Per cell 0 or number of layers in the cell column it is part of
-    labelList cellNLayers;
+    labelList cellNLayers(mesh.nCells(), Zero);
     // Per face actual overall layer thickness
-    scalarField faceRealThickness;
+    scalarField faceRealThickness(mesh.nFaces(), Zero);
     // Per face wanted overall layer thickness
     scalarField faceWantedThickness(mesh.nFaces(), Zero);
     {