diff --git a/impression/impression_canon.py b/impression/impression_canon.py
index 54f1e9ab..93c8e9c7 100755
--- a/impression/impression_canon.py
+++ b/impression/impression_canon.py
@@ -214,7 +214,7 @@ class impression:
                 # Hack pour mieux reconnaître les formats
                 w = min(self._width,self._height)
                 h = max(self._width,self._height)
-                err = 20
+                err = 100
                 if abs(w - 595) < err and abs(h - 842) < err:
                     self._format = "(A4)"
                 elif abs(w - 842) < err and abs(h - 1180) < err: