diff --git a/Modules/Core/Common/include/itkDefaultVectorPixelAccessor.h b/Modules/Core/Common/include/itkDefaultVectorPixelAccessor.h
index a255665e92b..a63bb448e70 100644
--- a/Modules/Core/Common/include/itkDefaultVectorPixelAccessor.h
+++ b/Modules/Core/Common/include/itkDefaultVectorPixelAccessor.h
@@ -63,7 +63,7 @@ class ITK_TEMPLATE_EXPORT DefaultVectorPixelAccessor
 
   /** Set output using the value in input */
   inline void
-  Set(InternalType & output, const ExternalType & input, const unsigned long offset) const
+  Set(InternalType & output, const ExternalType & input, const SizeValueType offset) const
   {
     InternalType * truePixel = (&output) + offset * m_OffsetMultiplier;
 
diff --git a/Modules/Core/ImageAdaptors/include/itkNthElementPixelAccessor.h b/Modules/Core/ImageAdaptors/include/itkNthElementPixelAccessor.h
index 9ef242e27f6..1ac2e54224a 100644
--- a/Modules/Core/ImageAdaptors/include/itkNthElementPixelAccessor.h
+++ b/Modules/Core/ImageAdaptors/include/itkNthElementPixelAccessor.h
@@ -144,7 +144,7 @@ class NthElementPixelAccessor<TOutputPixelType, itk::VariableLengthVector<TPixel
   }
 
   inline void
-  Set(InternalType & output, const ExternalType & input, const unsigned long offset) const
+  Set(InternalType & output, const ExternalType & input, const SizeValueType offset) const
   {
     // note: v is a reference to the internal buffer, this method of
     // access relies on return value optimization to work
diff --git a/Modules/Core/ImageAdaptors/include/itkVectorImageToImageAdaptor.h b/Modules/Core/ImageAdaptors/include/itkVectorImageToImageAdaptor.h
index 6b838bf9f63..42d0e8e1de5 100644
--- a/Modules/Core/ImageAdaptors/include/itkVectorImageToImageAdaptor.h
+++ b/Modules/Core/ImageAdaptors/include/itkVectorImageToImageAdaptor.h
@@ -66,7 +66,7 @@ class VectorImageToImagePixelAccessor : private DefaultVectorPixelAccessor<TType
   }
 
   inline void
-  Set(InternalType & output, const ExternalType & input, const unsigned long offset) const
+  Set(InternalType & output, const ExternalType & input, const SizeValueType offset) const
   {
     return Set(Superclass::Get(output, offset), input);
   }