--- VTK5.10.1/Domains/Chemistry/vtkOpenQubeElectronicData.h.orig	2012-10-15 22:33:21.000000000 +0200
+++ VTK5.10.1/Domains/Chemistry/vtkOpenQubeElectronicData.h	2012-12-25 07:56:14.818567966 +0100
@@ -43,7 +43,7 @@
 
   // Description:
   // Returns the number of electrons in the molecule.
-  unsigned int GetNumberOfElectrons();
+  vtkIdType GetNumberOfElectrons();
 
   // Description:
   // Returns the vtkImageData for the requested molecular orbital. The data
--- VTK5.10.1/Domains/Chemistry/vtkOpenQubeElectronicData.cxx.orig	2012-10-15 22:33:21.000000000 +0200
+++ VTK5.10.1/Domains/Chemistry/vtkOpenQubeElectronicData.cxx	2012-12-25 07:55:31.765235532 +0100
@@ -164,7 +164,7 @@
 }
 
 //----------------------------------------------------------------------------
-unsigned int vtkOpenQubeElectronicData::GetNumberOfElectrons()
+vtkIdType vtkOpenQubeElectronicData::GetNumberOfElectrons()
 {
   if (!this->BasisSet || !this->BasisSet->isValid())
     {