diff --git a/lib/src/Uncertainty/Algorithm/MetaModel/FunctionalChaos/FunctionalChaosValidation.cxx b/lib/src/Uncertainty/Algorithm/MetaModel/FunctionalChaos/FunctionalChaosValidation.cxx
index f5286b79de3..8ffe3e51311 100644
--- a/lib/src/Uncertainty/Algorithm/MetaModel/FunctionalChaos/FunctionalChaosValidation.cxx
+++ b/lib/src/Uncertainty/Algorithm/MetaModel/FunctionalChaos/FunctionalChaosValidation.cxx
@@ -144,7 +144,7 @@ Sample FunctionalChaosValidation::ComputeMetamodelCrossValidationPredictions(
     Indices indicesTest;
     for (UnsignedInteger foldIndex = 0; foldIndex < kParameter; ++foldIndex)
     {
-      [[maybe_unused]] const Indices indicesTrain(splitter.generate(indicesTest));
+      splitter.generate(indicesTest);
       const UnsignedInteger foldSize = indicesTest.getSize();
       SymmetricMatrix projectionKFoldMatrix(foldSize);
       for (UnsignedInteger i1 = 0; i1 < foldSize; ++i1)
diff --git a/lib/src/Uncertainty/Algorithm/MetaModel/LinearModel/LinearModelValidation.cxx b/lib/src/Uncertainty/Algorithm/MetaModel/LinearModel/LinearModelValidation.cxx
index b96f803c7e4..e5bc67dfa3a 100644
--- a/lib/src/Uncertainty/Algorithm/MetaModel/LinearModel/LinearModelValidation.cxx
+++ b/lib/src/Uncertainty/Algorithm/MetaModel/LinearModel/LinearModelValidation.cxx
@@ -149,7 +149,7 @@ Sample LinearModelValidation::ComputeMetamodelKFoldPredictions(
   for (UnsignedInteger foldIndex = 0; foldIndex < kParameter; ++foldIndex)
   {
     Indices indicesTest;
-    [[maybe_unused]] const Indices indicesTrain(splitter.generate(indicesTest));
+    splitter.generate(indicesTest);
     const UnsignedInteger foldSize = indicesTest.getSize();
     SymmetricMatrix projectionKFoldMatrix(foldSize);
     for (UnsignedInteger i1 = 0; i1 < foldSize; ++i1)