diff --git a/src/rougail/user_data_environment/data.py b/src/rougail/user_data_environment/data.py
index 73ef217..2e7c8ca 100644
--- a/src/rougail/user_data_environment/data.py
+++ b/src/rougail/user_data_environment/data.py
@@ -22,7 +22,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 import os
 from rougail.tiramisu import CONVERT_OPTION
 from rougail.config import RougailConfig
-from rougail.error import ExtentionError
+from rougail.error import ExtensionError
 from tiramisu.error import ValueOptionError
 
 
@@ -43,7 +43,7 @@ class RougailUserDataEnvironment:
                 rougailconfig["step.user_data"] = user_data
         user_data = rougailconfig["step.user_data"]
         if "environment" not in user_data:
-            raise ExtentionError("environment is not set in step.user_data")
+            raise ExtensionError("environment is not set in step.user_data")
         if "environment.with_secrets" in rougailconfig:
             self.with_secrets = rougailconfig["environment.with_secrets"]
         else: