diff --git a/mistral/api/controllers/v2/resources.py b/mistral/api/controllers/v2/resources.py
index a30af4c5..db49183a 100644
--- a/mistral/api/controllers/v2/resources.py
+++ b/mistral/api/controllers/v2/resources.py
@@ -213,8 +213,8 @@ class Execution(resource.Resource):
     "description of workflow execution."
 
     params = types.jsontype
-    "params define workflow type specific parameters. For example, reverse \
-    workflow takes one parameter 'task_name' that defines a target task."
+    ("params define workflow type specific parameters. For example, reverse "
+     "workflow takes one parameter 'task_name' that defines a target task.")
 
     task_execution_id = wtypes.text
     "reference to the parent task execution"
@@ -282,8 +282,8 @@ class Task(resource.Resource):
     workflow_execution_id = wtypes.text
 
     state = wtypes.text
-    "state can take one of the following values: \
-    IDLE, RUNNING, SUCCESS, ERROR, DELAYED"
+    ("state can take one of the following values: "
+     "IDLE, RUNNING, SUCCESS, ERROR, DELAYED")
 
     state_info = wtypes.text
     "an optional state information string"
diff --git a/mistral/services/expiration_policy.py b/mistral/services/expiration_policy.py
index c30c7d90..27d2e8f9 100644
--- a/mistral/services/expiration_policy.py
+++ b/mistral/services/expiration_policy.py
@@ -86,8 +86,8 @@ def run_execution_expiration_policy(self, ctx):
                 )
                 db_api.delete_workflow_execution(execution.id)
             except Exception as e:
-                msg = "Failed to delete [execution_id=%s]\n %s" \
-                      % (execution.id, traceback.format_exc(e))
+                msg = ("Failed to delete [execution_id=%s]\n %s"
+                       % (execution.id, traceback.format_exc(e)))
                 LOG.warning(msg)
             finally:
                 auth_ctx.set_ctx(None)
diff --git a/mistral_tempest_tests/tests/api/v2/test_action_executions.py b/mistral_tempest_tests/tests/api/v2/test_action_executions.py
index 6297e5ac..4065e326 100644
--- a/mistral_tempest_tests/tests/api/v2/test_action_executions.py
+++ b/mistral_tempest_tests/tests/api/v2/test_action_executions.py
@@ -126,8 +126,9 @@ class ActionExecutionTestsV2(base.TestCase):
         resp, body = self.client.create_action_execution(
             {
                 'name': 'std.http',
-                'input': '{{"url": "http://localhost:8989/v2/workflows",\
-                           "headers": {{"X-Auth-Token": "{}"}}}}'.format(token)
+                'input': ('{{"url": "http://localhost:8989/v2/workflows",'
+                          '"headers": {{"X-Auth-Token": "{}"}}}}'
+                          ).format(token)
             }
         )