diff --git a/source/app/controllers/util.py b/source/app/controllers/util.py
index ddd9f40..1b10fc0 100644
--- a/source/app/controllers/util.py
+++ b/source/app/controllers/util.py
@@ -832,7 +832,7 @@ class LIBO(object):
             cantidad = concepto['cantidad']
             valor_unitario = concepto['valorunitario']
             importe = concepto['importe']
-            descuento = concepto.get('descuento', 0.0)
+            descuento = concepto.get('descuento', '0.0')
             if first:
                 first = False
                 cell_1 = self._set_cell('{noidentificacion}', key)