diff --git a/src/main/java/eu/dnetlib/repo/manager/service/RepositoryServiceImpl.java b/src/main/java/eu/dnetlib/repo/manager/service/RepositoryServiceImpl.java
index e88d1bc..c1750c1 100644
--- a/src/main/java/eu/dnetlib/repo/manager/service/RepositoryServiceImpl.java
+++ b/src/main/java/eu/dnetlib/repo/manager/service/RepositoryServiceImpl.java
@@ -548,7 +548,7 @@ public class RepositoryServiceImpl implements RepositoryService {
             repository.setNamespacePrefix("issn" + repository.getIssn());
             this.storeRepository(repository, SecurityContextHolder.getContext().getAuthentication());
         } else if (datatype.equals("aggregator")) {
-            repository.setId("openaire____::" + com.unboundid.util.Base64.encode(repository.getOfficialName()));
+            repository.setId("openaire____::" + DigestUtils.md5Hex(repository.getOfficialName()));
             repository.setNamespacePrefix(DigestUtils.md5Hex(repository.getOfficialName()).substring(0, 12));
             this.storeRepository(repository, SecurityContextHolder.getContext().getAuthentication());
         } else {