diff --git a/Modules/Applications/AppClassification/app/otbTrainVectorRegression.cxx b/Modules/Applications/AppClassification/app/otbTrainVectorRegression.cxx
index 52f7a9dd004dd5e2a943050570e4f51b1fe08481..1bff521a0371ab761fd4457bd90d07348c3ae92b 100644
--- a/Modules/Applications/AppClassification/app/otbTrainVectorRegression.cxx
+++ b/Modules/Applications/AppClassification/app/otbTrainVectorRegression.cxx
@@ -41,6 +41,11 @@ public:
   typedef Superclass::TargetListSampleType TargetListSampleType;
 
 protected:
+  TrainVectorRegression()
+  {
+    this->m_RegressionFlag = true;
+  }
+  
   void DoInit() override
   {
     SetName( "TrainVectorRegression" );