diff --git a/src/main/java/org/gcube/dataanalysis/ecoengine/transducers/InterpolationTransducer.java b/src/main/java/org/gcube/dataanalysis/ecoengine/transducers/InterpolationTransducer.java
index 47d54ea..c251a57 100644
--- a/src/main/java/org/gcube/dataanalysis/ecoengine/transducers/InterpolationTransducer.java
+++ b/src/main/java/org/gcube/dataanalysis/ecoengine/transducers/InterpolationTransducer.java
@@ -84,7 +84,7 @@ public class InterpolationTransducer implements Transducerer{
 		PrimitiveType p10 = new PrimitiveType(Integer.class.getName(), null, PrimitiveTypes.NUMBER, "YearEnd", "The year associated to the SecondHCAF parameter","2050");
 		PrimitiveType p11 = new PrimitiveType(Integer.class.getName(), null, PrimitiveTypes.NUMBER, "NumberOfInterpolations", "Number of Intermediate Interpolation points","2");
 		
-		PrimitiveType p12 = new PrimitiveType(Enum.class.getName(), InterpolateTables.INTERPOLATIONFUNCTIONS.values(), PrimitiveTypes.ENUMERATED, "InterpolationFunction", "The interpolation Function to use","");
+		PrimitiveType p12 = new PrimitiveType(Enum.class.getName(), InterpolateTables.INTERPOLATIONFUNCTIONS.values(), PrimitiveTypes.ENUMERATED, "InterpolationFunction", "The interpolation Function to use",""+InterpolateTables.INTERPOLATIONFUNCTIONS.LINEAR);
 				
 		parameters.add(p1);
 		parameters.add(p2);