diff --git a/tcp_tests/helpers/containers.py b/tcp_tests/helpers/containers.py
index 7d1306a..f7f78af 100644
--- a/tcp_tests/helpers/containers.py
+++ b/tcp_tests/helpers/containers.py
@@ -148,7 +148,7 @@
              "failed: {1}.").format(self.image_name, result)
         result = self.remote.execute(check_alias_cmd)
         assert result['exit_code'] == 0, \
-            ("Alias creation for running {} from container "
+            ("Alias creation for running {0} from container "
              "failed: {1}.").format(self.image_name, result)
 
     def setup(self):
diff --git a/tcp_tests/helpers/env_config.py b/tcp_tests/helpers/env_config.py
index b811030..ef07866 100644
--- a/tcp_tests/helpers/env_config.py
+++ b/tcp_tests/helpers/env_config.py
@@ -223,7 +223,7 @@
     elif i_count > 0 and not isinstance(data[key], list):
         raise TypeError(
             ("Key '{0}' by '{1}' keypath expected as list "
-             "but '{3}' obj found").format(
+             "but '{2}' obj found").format(
                  key, keypath(walked_paths), type(data[key]).__name__
             )
         )