diff --git a/Modules/Core/Common/test/itkFixedArrayTest2.cxx b/Modules/Core/Common/test/itkFixedArrayTest2.cxx
index ba05fed2986..5864192d4d1 100644
--- a/Modules/Core/Common/test/itkFixedArrayTest2.cxx
+++ b/Modules/Core/Common/test/itkFixedArrayTest2.cxx
@@ -20,7 +20,6 @@
 #include "itkFixedArray.h"
 #include <ctime>
 #include <cstring>
-#include <cstring>
 
 int
 itkFixedArrayTest2(int, char *[])
diff --git a/Modules/Filtering/Thresholding/test/itkOtsuMultipleThresholdsImageFilterTest.cxx b/Modules/Filtering/Thresholding/test/itkOtsuMultipleThresholdsImageFilterTest.cxx
index 7f1a5abba16..78bb14d5ace 100644
--- a/Modules/Filtering/Thresholding/test/itkOtsuMultipleThresholdsImageFilterTest.cxx
+++ b/Modules/Filtering/Thresholding/test/itkOtsuMultipleThresholdsImageFilterTest.cxx
@@ -22,7 +22,6 @@
 #include "itkImageFileWriter.h"
 #include "itkSimpleFilterWatcher.h"
 #include "itkTestingMacros.h"
-#include "itkTestingMacros.h"
 
 
 int
diff --git a/Modules/IO/BMP/test/itkBMPImageIOTest.cxx b/Modules/IO/BMP/test/itkBMPImageIOTest.cxx
index 54c50971521..4f4b361404a 100644
--- a/Modules/IO/BMP/test/itkBMPImageIOTest.cxx
+++ b/Modules/IO/BMP/test/itkBMPImageIOTest.cxx
@@ -17,7 +17,6 @@
  *=========================================================================*/
 #include "itkImageFileReader.h"
 #include "itkImageFileWriter.h"
-#include "itkImageFileWriter.h"
 #include "itkTestingMacros.h"
 #include <fstream>
 
diff --git a/Modules/Registration/Metricsv4/test/itkMeanSquaresImageToImageMetricv4Test.cxx b/Modules/Registration/Metricsv4/test/itkMeanSquaresImageToImageMetricv4Test.cxx
index a2e6e79db21..0cf5df60d0e 100644
--- a/Modules/Registration/Metricsv4/test/itkMeanSquaresImageToImageMetricv4Test.cxx
+++ b/Modules/Registration/Metricsv4/test/itkMeanSquaresImageToImageMetricv4Test.cxx
@@ -18,7 +18,6 @@
 #include "itkMeanSquaresImageToImageMetricv4.h"
 #include "itkTranslationTransform.h"
 #include "itkMath.h"
-#include "itkMath.h"
 
 /* Simple test to verify that class builds and runs.
  * Results are not verified. See ImageToImageMetricv4Test