diff --git a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/crossref/Crossref2Oaf.scala b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/crossref/Crossref2Oaf.scala
index 92d3004d9..f46706e5f 100644
--- a/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/crossref/Crossref2Oaf.scala
+++ b/dhp-workflows/dhp-doiboost/src/main/java/eu/dnetlib/doiboost/crossref/Crossref2Oaf.scala
@@ -15,6 +15,7 @@ import scala.collection.JavaConverters._
 import scala.collection.mutable
 import scala.util.matching.Regex
 import eu.dnetlib.dhp.schema.scholexplorer.OafUtils
+import eu.dnetlib.doiboost.DoiBoostMappingUtil
 
 case class CrossrefDT(doi: String, json:String, timestamp: Long) {}
 
@@ -86,7 +87,7 @@ case object Crossref2Oaf {
     implicit lazy val formats: DefaultFormats.type = org.json4s.DefaultFormats
 
     //MAPPING Crossref DOI into PID
-    val doi: String = (json \ "DOI").extract[String]
+    val doi: String = DoiBoostMappingUtil.normalizeDoi((json \ "DOI").extract[String])
     result.setPid(List(createSP(doi, "doi", ModelConstants.DNET_PID_TYPES)).asJava)
 
     //MAPPING Crossref DOI into OriginalId