diff --git a/ldap/schema/data/src/main/java/org/apache/directory/shared/ldap/schemamanager/impl/DefaultSchemaManager.java b/ldap/schema/data/src/main/java/org/apache/directory/shared/ldap/schemamanager/impl/DefaultSchemaManager.java
index a1e9b61..1df6642 100644
--- a/ldap/schema/data/src/main/java/org/apache/directory/shared/ldap/schemamanager/impl/DefaultSchemaManager.java
+++ b/ldap/schema/data/src/main/java/org/apache/directory/shared/ldap/schemamanager/impl/DefaultSchemaManager.java
@@ -1668,7 +1668,7 @@
 
         if ( !( schemaObject instanceof MutableLoadableSchemaObject ) )
         {
-            copy = schemaObject.copy();
+            copy = schemaObject.copyMutable();
         }
         else
         {