pyderasn.py | 4 +---

diff --git a/pyderasn.py b/pyderasn.py
index e1e9dae2981ea30175bdb2452f9e1f3f2e140151e5fef44f71e313b382747cc6..6d39433e8786f3cec82565e8a0c09b4ea0741e6ed17eff393afedd83488731ad 100755
--- a/pyderasn.py
+++ b/pyderasn.py
@@ -5251,9 +5251,7 @@     def totzdatetime(self):
         try:
             return self._value.replace(tzinfo=tzUTC)
         except TypeError as err:
-            raise NotImplementedError(
-                "Package python-dateutil is required to use this feature",
-            ) from err
+            raise NotImplementedError("Missing dateutil.tz") from err
 
     def __repr__(self):
         return pp_console_row(next(self.pps()))