diff --git a/impression/class_impression.py b/impression/class_impression.py
index 0586d386..f921cd51 100755
--- a/impression/class_impression.py
+++ b/impression/class_impression.py
@@ -211,6 +211,7 @@ class fichier_impression :
             return "<p>"+body+"</p>"
 
         def enregistre_pdf(self,f_value,f_nom,dossier):
+	    f_nom=f_nom.translate(string.maketrans(string.punctuation+string.whitespace,'______________________________________'))
             (fd_fichier_desc,self.nom_fichier_desc) = tempfile.mkstemp(suffix='.desc',prefix=f_nom,dir=dossier)
             os.close(fd_fichier_desc)
             os.chmod(self.nom_fichier_desc,33184)