diff --git a/impression/impression_canon.py b/impression/impression_canon.py
index a1ebbe8c..2afcf895 100755
--- a/impression/impression_canon.py
+++ b/impression/impression_canon.py
@@ -216,12 +216,22 @@ class impression:
 
 
     def _pdfbook(self):
+        page = "pdfinfo \"%s\" | grep Pages | awk '{print $2}'" % self._fichier
+        (status, npage) = getstatusoutput(page)
+        if status != 0:
+            self.log.error("pdfinfo status:%d |  rep: %s" % (status, npage))
+            raise FichierInvalide, ("pdfinfo: Impossible de trouver le nombre de page du fichier",
+                                    self._fichier)
+        if int(int(npage)/4*4) < int(npage):
+            sig=int((int(npage)/4 +1)*4)
+        else:
+            sig=int(npage)
         if self._settings['papier'] == 'A3':
             newfile =  self._fichier[:-4] + '-a3book.pdf'
-            pdfbook = "pdfbook --paper a3paper %%s --outfile %s" % newfile
+            pdfbook = "pdfbook --signature %s --paper a3paper %%s --outfile %s" % (sig,newfile)
         else:
             newfile = self._fichier[:-4] + '-book.pdf'
-            pdfbook = "pdfbook %%s --outfile %s" % newfile
+            pdfbook = "pdfbook --signature %s %%s --outfile %s" % (sig,newfile)
         (status, rep) = getstatusoutput(pdfbook % self._fichier)
         self.log.info("%s |  rep: %s" % ((pdfbook % self._fichier), rep))
         self._fichier = newfile