diff --git a/core/src/main/java/org/springframework/ldap/odm/core/impl/ObjectMetaData.java b/core/src/main/java/org/springframework/ldap/odm/core/impl/ObjectMetaData.java
index 5178c3e5..98ff8724 100755
--- a/core/src/main/java/org/springframework/ldap/odm/core/impl/ObjectMetaData.java
+++ b/core/src/main/java/org/springframework/ldap/odm/core/impl/ObjectMetaData.java
@@ -38,7 +38,7 @@ import java.util.TreeSet;
                 return 0;
             }
 
-            return Integer.compare(a1.getDnAttribute().index(), a2.getDnAttribute().index());
+            return Integer.valueOf(a1.getDnAttribute().index()).compareTo(a2.getDnAttribute().index());
         }
     });