diff --git a/Modules/IO/TestKernel/include/otbReadDataFile.h b/Modules/IO/TestKernel/include/otbReadDataFile.h
index 5ba16330a2581fd991077f5e7fb3d5b10ab4d4a7..0e7174be6ec50038bb217f4248cbd5be604d6566 100644
--- a/Modules/IO/TestKernel/include/otbReadDataFile.h
+++ b/Modules/IO/TestKernel/include/otbReadDataFile.h
@@ -50,6 +50,7 @@ bool ReadDataFile(
     return false;
     }
 
+  labels->SetMeasurementVectorSize(1);
   unsigned int nbfeatures = 0;
 
   while (!ifs.eof())