diff --git a/impression/couts.py b/impression/couts.py
index 2c5a82af..9f50bc28 100755
--- a/impression/couts.py
+++ b/impression/couts.py
@@ -111,9 +111,13 @@ class cout:
         else:
             cout_coul = impression.c_coul
             cout_noir = impression.c_noir
-            if (media == "transparent"):
+            if media == "transparent":
                 c_taille = impression.c_trans
                 self.media="transparent"
+                if recto_v == "Recto-verso":
+                    self.erreur="Recto-verso invalide avec transparent"
+                    del tmpfichier
+                    return
             else:
                 c_taille = impression.c_a4