diff --git a/src/main/java/org/gcube/dataanalysis/executor/rscripts/generic/GenericRScript.java b/src/main/java/org/gcube/dataanalysis/executor/rscripts/generic/GenericRScript.java
index fa958e7..7c65c95 100644
--- a/src/main/java/org/gcube/dataanalysis/executor/rscripts/generic/GenericRScript.java
+++ b/src/main/java/org/gcube/dataanalysis/executor/rscripts/generic/GenericRScript.java
@@ -236,7 +236,7 @@ public abstract class GenericRScript extends StandardLocalInfraAlgorithm {
 				}
 				if (rowFile.exists()) {
 
-					String preparedFile = new File(config.getConfigPath(), UUID.randomUUID()+rowFile.getName()).getAbsolutePath();
+					String preparedFile = new File(config.getConfigPath(), UUID.randomUUID()+"_"+rowFile.getName()).getAbsolutePath();
 					LOGGER.debug("Copying " + rowFile.getAbsolutePath() + " to " + preparedFile);
 					try{
 					org.gcube.dataanalysis.executor.rscripts.generic.FileUtils.moveFileToDirectory(rowFile, new File(config.getConfigPath()),new File(preparedFile), false);