diff --git a/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/collection/crossref/Crossref2Oaf.scala b/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/collection/crossref/Crossref2Oaf.scala
index c4aa64fd4..27eaa61b5 100644
--- a/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/collection/crossref/Crossref2Oaf.scala
+++ b/dhp-workflows/dhp-aggregation/src/main/scala/eu/dnetlib/dhp/collection/crossref/Crossref2Oaf.scala
@@ -93,7 +93,7 @@ case object Crossref2Oaf {
 
     val cf = new KeyValue
     cf.setValue("UnpayWall")
-    cf.setKey(s"10|openaire____:${DHPUtils.md5("UnpayWall".toLowerCase)}")
+    cf.setKey(s"10|openaire____::${DHPUtils.md5("UnpayWall".toLowerCase)}")
     cf
 
   }