diff --git a/openerp/report/render/rml2txt/utils.py b/openerp/report/render/rml2txt/utils.py
index 122411afb2d..174612d847e 100644
--- a/openerp/report/render/rml2txt/utils.py
+++ b/openerp/report/render/rml2txt/utils.py
@@ -19,6 +19,7 @@
 #
 ##############################################################################
 
+import copy
 import re
 import reportlab
 import reportlab.lib.units