diff --git a/Testing/Code/IO/otbImageFileReaderERS.cxx b/Testing/Code/IO/otbImageFileReaderERS.cxx
index 53e7b969c72aa2bdd0b50d3652dc6b589b29831c..95ad9cc959fa5b8e7110d63d5817cfd2b50cd6da 100644
--- a/Testing/Code/IO/otbImageFileReaderERS.cxx
+++ b/Testing/Code/IO/otbImageFileReaderERS.cxx
@@ -36,7 +36,7 @@ int otbImageFileReaderERS(int argc, char* argv[])
   const char * outputFilename = argv[2];
 
   typedef float  	                   InputPixelType;
-  typedef unsigned short                   OutputPixelType;
+  typedef short                            OutputPixelType;
   const   unsigned int        	           Dimension = 2;
 
   typedef otb::VectorImage< InputPixelType,  Dimension >        InputImageType;