diff --git a/mistral/engine1/base.py b/mistral/engine1/base.py
index 10ef70913..0fb3326ad 100644
--- a/mistral/engine1/base.py
+++ b/mistral/engine1/base.py
@@ -19,20 +19,6 @@ import abc
 import six
 
 
-class TaskResult(object):
-    """Explicit data structure containing a result of task execution."""
-
-    def __init__(self, data=None, error=None):
-        self.data = data
-        self.error = error
-
-    def is_error(self):
-        return self.error is not None
-
-    def is_success(self):
-        return not self.is_error()
-
-
 @six.add_metaclass(abc.ABCMeta)
 class Engine(object):
     """Engine interface."""
diff --git a/mistral/engine1/default_engine.py b/mistral/engine1/default_engine.py
index d01f6c47d..12e4c55e4 100644
--- a/mistral/engine1/default_engine.py
+++ b/mistral/engine1/default_engine.py
@@ -18,10 +18,10 @@ from oslo.config import cfg
 
 from mistral.db import api as db_api
 from mistral.engine1 import base
-from mistral.engine1 import states
 from mistral import exceptions as exc
 from mistral.openstack.common import log as logging
 from mistral.workflow import selector as wf_selector
+from mistral.workflow import states
 
 LOG = logging.getLogger(__name__)
 WF_TRACE = logging.getLogger(cfg.CONF.workflow_trace_log_name)
diff --git a/mistral/tests/unit/engine1/test_states.py b/mistral/tests/unit/engine1/test_states.py
index a30d51613..0b2097427 100644
--- a/mistral/tests/unit/engine1/test_states.py
+++ b/mistral/tests/unit/engine1/test_states.py
@@ -14,9 +14,9 @@
 #    See the License for the specific language governing permissions and
 #    limitations under the License.
 
-from mistral.engine1 import states as s
 from mistral.openstack.common import log as logging
 from mistral.tests import base
+from mistral.workflow import states as s
 
 LOG = logging.getLogger(__name__)
 
diff --git a/mistral/tests/unit/workflow/test_reverse_workflow.py b/mistral/tests/unit/workflow/test_reverse_workflow.py
index cc2f491a9..38013203a 100644
--- a/mistral/tests/unit/workflow/test_reverse_workflow.py
+++ b/mistral/tests/unit/workflow/test_reverse_workflow.py
@@ -15,13 +15,12 @@
 #    limitations under the License.
 
 from mistral.db.v2.sqlalchemy import models
-# TODO(rakhmerov): Should the next two be in package 'workflow'?
-from mistral.engine1 import base as eng_base
-from mistral.engine1 import states
 from mistral.openstack.common import log as logging
 from mistral.tests import base
 from mistral.workbook import parser as spec_parser
+from mistral.workflow import base as wf_base
 from mistral.workflow import reverse_workflow as r_wf
+from mistral.workflow import states
 
 
 LOG = logging.getLogger(__name__)
@@ -92,7 +91,7 @@ class ReverseWorkflowHandlerTest(base.BaseTest):
         # Emulate finishing 'task1'.
         task_specs = self.handler.on_task_result(
             task1_db,
-            eng_base.TaskResult(data='Hey')
+            wf_base.TaskResult(data='Hey')
         )
 
         self.assertEqual(1, len(task_specs))
@@ -107,7 +106,7 @@ class ReverseWorkflowHandlerTest(base.BaseTest):
 
         task_specs = self.handler.on_task_result(
             task2_db,
-            eng_base.TaskResult(data='Hi!')
+            wf_base.TaskResult(data='Hi!')
         )
 
         self.assertEqual(0, len(task_specs))
diff --git a/mistral/workflow/base.py b/mistral/workflow/base.py
index 2d167d950..4635fe228 100644
--- a/mistral/workflow/base.py
+++ b/mistral/workflow/base.py
@@ -13,10 +13,10 @@
 #    limitations under the License.
 
 import abc
-from mistral.engine1 import states
 from mistral import exceptions as exc
 from mistral.openstack.common import log as logging
 from mistral.workbook import parser as spec_parser
+from mistral.workflow import states
 
 LOG = logging.getLogger(__name__)
 
@@ -96,6 +96,20 @@ class WorkflowHandler(object):
             raise exc.WorkflowException(msg)
 
 
+class TaskResult(object):
+    """Explicit data structure containing a result of task execution."""
+
+    def __init__(self, data=None, error=None):
+        self.data = data
+        self.error = error
+
+    def is_error(self):
+        return self.error is not None
+
+    def is_success(self):
+        return not self.is_error()
+
+
 class FlowControl(object):
     """Flow control structure.
 
diff --git a/mistral/workflow/reverse_workflow.py b/mistral/workflow/reverse_workflow.py
index 483c28325..6e5acd8ea 100644
--- a/mistral/workflow/reverse_workflow.py
+++ b/mistral/workflow/reverse_workflow.py
@@ -15,9 +15,9 @@
 import networkx as nx
 from networkx.algorithms import traversal
 
-from mistral.engine1 import states
 from mistral import exceptions as exc
 from mistral.workflow import base
+from mistral.workflow import states
 
 
 class ReverseWorkflowHandler(base.WorkflowHandler):
diff --git a/mistral/engine1/states.py b/mistral/workflow/states.py
similarity index 100%
rename from mistral/engine1/states.py
rename to mistral/workflow/states.py