diff --git a/dhp-workflows/dhp-swh/src/main/java/eu/dnetlib/dhp/swh/PrepareSWHActionsets.java b/dhp-workflows/dhp-swh/src/main/java/eu/dnetlib/dhp/swh/PrepareSWHActionsets.java
index 93d111039..2239244d6 100644
--- a/dhp-workflows/dhp-swh/src/main/java/eu/dnetlib/dhp/swh/PrepareSWHActionsets.java
+++ b/dhp-workflows/dhp-swh/src/main/java/eu/dnetlib/dhp/swh/PrepareSWHActionsets.java
@@ -162,7 +162,7 @@ public class PrepareSWHActionsets {
 						.asList(
 							OafMapperUtils
 								.structuredProperty(
-									row.getString(row.fieldIndex("swhid")),
+									String.format("swh:1:snp:%s", row.getString(row.fieldIndex("swhid"))),
 									qualifier,
 									dataInfo)));