diff --git a/archiva-modules/archiva-base/archiva-repository-admin/src/main/java/org/apache/archiva/admin/repository/remote/DefaultRemoteRepositoryAdmin.java b/archiva-modules/archiva-base/archiva-repository-admin/src/main/java/org/apache/archiva/admin/repository/remote/DefaultRemoteRepositoryAdmin.java
index 99d80cf50..732a479a0 100644
--- a/archiva-modules/archiva-base/archiva-repository-admin/src/main/java/org/apache/archiva/admin/repository/remote/DefaultRemoteRepositoryAdmin.java
+++ b/archiva-modules/archiva-base/archiva-repository-admin/src/main/java/org/apache/archiva/admin/repository/remote/DefaultRemoteRepositoryAdmin.java
@@ -115,7 +115,8 @@ public class DefaultRemoteRepositoryAdmin
 
         // TODO use ProxyConnectorAdmin interface ?
         // [MRM-520] Proxy Connectors are not deleted with the deletion of a Repository.
-        List<ProxyConnectorConfiguration> proxyConnectors = configuration.getProxyConnectors();
+        List<ProxyConnectorConfiguration> proxyConnectors =
+            new ArrayList<ProxyConnectorConfiguration>( configuration.getProxyConnectors() );
         for ( ProxyConnectorConfiguration proxyConnector : proxyConnectors )
         {
             if ( StringUtils.equals( proxyConnector.getTargetRepoId(), repositoryId ) )