diff --git a/impression/impression_hp.py b/impression/impression_hp.py
index e3336113..0f9ae9ce 100644
--- a/impression/impression_hp.py
+++ b/impression/impression_hp.py
@@ -459,9 +459,6 @@ class impression(object):
         #Et on ne les veux pas assemblées (sic)
         options += ['-o', 'Collate=True']
 
-        # Pour donner le login de l'adherent (TODO: useful ?)
-        #options += ['-U', str(self._adh)]
-
         if self._settings['papier'].value == 'A4':
             options += ['-o', 'PageSize=A4']
         else:
@@ -488,6 +485,7 @@ class impression(object):
 
         if not self._settings['couleur'].value:
             options += ['-o', 'HPColorAsGray=True']
+            options += ['-o', 'ColorModel=Grayscale']
 
         duplex = self._settings['recto_verso'].value or\
                  self._settings['livret'].value