diff --git a/include/itkCannyEdgeDetectionRecursiveGaussianImageFilter.hxx b/include/itkCannyEdgeDetectionRecursiveGaussianImageFilter.hxx
index 8a0a966..cab667e 100644
--- a/include/itkCannyEdgeDetectionRecursiveGaussianImageFilter.hxx
+++ b/include/itkCannyEdgeDetectionRecursiveGaussianImageFilter.hxx
@@ -23,6 +23,7 @@
 #include "itkNumericTraits.h"
 #include "itkProgressReporter.h"
 #include "itkGradientMagnitudeImageFilter.h"
+#include "itkImageRegionIteratorWithIndex.h"
 #include <iostream>
 namespace itk
 {
diff --git a/test/itkRegionCompetitionImageFilterTest1.cxx b/test/itkRegionCompetitionImageFilterTest1.cxx
index 7d9d017..90b958e 100644
--- a/test/itkRegionCompetitionImageFilterTest1.cxx
+++ b/test/itkRegionCompetitionImageFilterTest1.cxx
@@ -19,6 +19,7 @@ const
 #include "itkRegionCompetitionImageFilter.h"
 #include "itkImageFileWriter.h"
 #include "itkImage.h"
+#include "itkImageRegionIteratorWithIndex.h"
 #include "itkTestingMacros.h"