diff --git a/eno-core/src/main/java/fr/insee/eno/core/processing/out/steps/lunatic/LunaticAddShapeToCalculatedVariables.java b/eno-core/src/main/java/fr/insee/eno/core/processing/out/steps/lunatic/LunaticAddShapeToCalculatedVariables.java
index 798a6bb74..d4f482169 100644
--- a/eno-core/src/main/java/fr/insee/eno/core/processing/out/steps/lunatic/LunaticAddShapeToCalculatedVariables.java
+++ b/eno-core/src/main/java/fr/insee/eno/core/processing/out/steps/lunatic/LunaticAddShapeToCalculatedVariables.java
@@ -25,6 +25,7 @@ public LunaticAddShapeToCalculatedVariables(EnoQuestionnaire enoQuestionnaire, S
     @Override
     public void apply(Questionnaire lunaticQuestionnaire) {
         List<VariableType> lunaticCalculatedVariables = lunaticQuestionnaire.getVariables().stream()
+                .filter(VariableType.class::isInstance)
                 .map(VariableType.class::cast)
                 .filter(variableType -> variableType.getVariableType().equals(VariableTypeEnum.CALCULATED))
                 .toList();