diff --git a/src/main/java/org/gcube/portlets/user/statisticalalgorithmsimporter/server/blackbox/GeneralPurposeScriptProducer.java b/src/main/java/org/gcube/portlets/user/statisticalalgorithmsimporter/server/blackbox/GeneralPurposeScriptProducer.java
index c5ff276..20f8667 100644
--- a/src/main/java/org/gcube/portlets/user/statisticalalgorithmsimporter/server/blackbox/GeneralPurposeScriptProducer.java
+++ b/src/main/java/org/gcube/portlets/user/statisticalalgorithmsimporter/server/blackbox/GeneralPurposeScriptProducer.java
@@ -97,7 +97,7 @@ public class GeneralPurposeScriptProducer {
 		sb.append("command = paste(external_process_to_invoke");
 
 		for (Triple in : input) {
-			sb.append("," + in.a);
+			sb.append(","+"paste('\"',"+in.a+",'\"',sep='')");
 		}
 
 		sb.append(",sep=\" \")" + System.lineSeparator());