diff --git a/Testing/Code/OBIA/otbHooverInstanceFilterToAttributeImage.cxx b/Testing/Code/OBIA/otbHooverInstanceFilterToAttributeImage.cxx
index 622d5ae33139559af661c1224dc8fec27685b6db..1efe06184733c4759b56ec0704241ff0170790af 100644
--- a/Testing/Code/OBIA/otbHooverInstanceFilterToAttributeImage.cxx
+++ b/Testing/Code/OBIA/otbHooverInstanceFilterToAttributeImage.cxx
@@ -84,10 +84,10 @@ int otbHooverInstanceFilterToAttributeImage(int argc, char* argv[])
   
   AttributeImageFilterType::Pointer attributeImageGT = AttributeImageFilterType::New();
   attributeImageGT->SetInput(instances->GetOutputGroundTruthLabelMap());
-  attributeImageGT->SetAttributeForNthChannel(0,instances->ATTRIBUTE_RC.c_str());
-  attributeImageGT->SetAttributeForNthChannel(1,instances->ATTRIBUTE_RF.c_str());
-  attributeImageGT->SetAttributeForNthChannel(2,instances->ATTRIBUTE_RA.c_str());
-  attributeImageGT->SetAttributeForNthChannel(3,instances->ATTRIBUTE_RM.c_str());
+  attributeImageGT->SetAttributeForNthChannel(0, instances->ATTRIBUTE_RC.c_str());
+  attributeImageGT->SetAttributeForNthChannel(1, instances->ATTRIBUTE_RF.c_str());
+  attributeImageGT->SetAttributeForNthChannel(2, instances->ATTRIBUTE_RA.c_str());
+  attributeImageGT->SetAttributeForNthChannel(3, instances->ATTRIBUTE_RM.c_str());
   
   WriterType::Pointer writer = WriterType::New();
   writer->SetInput(attributeImageGT->GetOutput());