diff --git a/Modules/Core/Common/include/itkConnectedImageNeighborhoodShape.h b/Modules/Core/Common/include/itkConnectedImageNeighborhoodShape.h
index 6ba76c593af..19eb29a0a12 100644
--- a/Modules/Core/Common/include/itkConnectedImageNeighborhoodShape.h
+++ b/Modules/Core/Common/include/itkConnectedImageNeighborhoodShape.h
@@ -19,12 +19,12 @@
 #ifndef itkConnectedImageNeighborhoodShape_h
 #define itkConnectedImageNeighborhoodShape_h
 
+#include "itkIntTypes.h" // For uintmax_t
 #include "itkMath.h"
 #include "itkOffset.h"
 
 #include <array>
 #include <cassert>
-#include <cstdint> // For uintmax_t
 #include <limits>
 
 namespace itk
diff --git a/Modules/Core/Common/include/itkSpatialOrientation.h b/Modules/Core/Common/include/itkSpatialOrientation.h
index ae41e35edd5..50d345f491e 100644
--- a/Modules/Core/Common/include/itkSpatialOrientation.h
+++ b/Modules/Core/Common/include/itkSpatialOrientation.h
@@ -28,7 +28,7 @@
 #ifndef itkSpatialOrientation_h
 #define itkSpatialOrientation_h
 
-#include <cstdint>
+#include "itkIntTypes.h"
 #include <ostream>
 
 #include "ITKCommonExport.h"
diff --git a/Modules/Core/SpatialObjects/include/itkImageMaskSpatialObject.hxx b/Modules/Core/SpatialObjects/include/itkImageMaskSpatialObject.hxx
index a2229d18b77..23d006a37dc 100644
--- a/Modules/Core/SpatialObjects/include/itkImageMaskSpatialObject.hxx
+++ b/Modules/Core/SpatialObjects/include/itkImageMaskSpatialObject.hxx
@@ -18,11 +18,10 @@
 #ifndef itkImageMaskSpatialObject_hxx
 #define itkImageMaskSpatialObject_hxx
 
+#include "itkIntTypes.h" // For uintmax_t.
 #include "itkMath.h"
 #include "itkImageRegionRange.h"
 
-#include <cstdint> // For uintmax_t.
-
 namespace itk
 {