diff --git a/source4/setup/provision_init.ldif b/source4/setup/provision_init.ldif
index ca044842e9f..a46c86aadcb 100644
--- a/source4/setup/provision_init.ldif
+++ b/source4/setup/provision_init.ldif
@@ -3,6 +3,7 @@ dn: @INDEXLIST
 @IDXATTR: sAMAccountName
 @IDXATTR: objectSid
 @IDXATTR: objectClass
+@IDXATTR: objectCategory
 @IDXATTR: member
 @IDXATTR: unixID
 @IDXATTR: unixName