diff --git a/src/dynamic_graph/sot/core/meta_task_posture.py b/src/dynamic_graph/sot/core/meta_task_posture.py
index e67a9ca4a29d925226c3437d7fb53dc582742679..0109cb8c2ac6ecfba2d25282392cb9491bf85a71 100644
--- a/src/dynamic_graph/sot/core/meta_task_posture.py
+++ b/src/dynamic_graph/sot/core/meta_task_posture.py
@@ -3,9 +3,7 @@ from dynamic_graph.sot.core import Flags
 from dynamic_graph.sot.core.feature_generic import FeatureGeneric
 from dynamic_graph.sot.core.gain_adaptive import GainAdaptive
 from dynamic_graph.sot.core.matrix_util import matrixToTuple, vectorToTuple
-from dynamic_graph.sot.core.meta_task_6d import (
-    toFlags,
-)  # noqa kept for backward compatibility
+from dynamic_graph.sot.core.meta_task_6d import toFlags  # noqa
 from dynamic_graph.sot.core.meta_tasks import setGain
 from dynamic_graph.sot.core.task import Task
 from numpy import identity, matrix, zeros
diff --git a/src/dynamic_graph/sot/core/meta_tasks.py b/src/dynamic_graph/sot/core/meta_tasks.py
index 45ce19fb73ad425df7f50b90eee1823139f0aec5..bd3875092d792caefc53bb75285b48d6f1b815c9 100644
--- a/src/dynamic_graph/sot/core/meta_tasks.py
+++ b/src/dynamic_graph/sot/core/meta_tasks.py
@@ -5,9 +5,7 @@ from dynamic_graph.sot.core import Flags
 from dynamic_graph.sot.core.feature_generic import FeatureGeneric
 from dynamic_graph.sot.core.gain_adaptive import GainAdaptive
 from dynamic_graph.sot.core.matrix_util import rpy2tr
-from dynamic_graph.sot.core.meta_task_6d import (
-    toFlags,
-)  # noqa kept for backward compatibility
+from dynamic_graph.sot.core.meta_task_6d import toFlags  # noqa
 
 
 class MetaTaskCom(object):
diff --git a/src/dynamic_graph/sot/core/meta_tasks_kine_relative.py b/src/dynamic_graph/sot/core/meta_tasks_kine_relative.py
index 8e2861d5554bcabf2e51f69163cce16314277fd8..7b243c633fcaef930791b0046c0c5130062ae046 100644
--- a/src/dynamic_graph/sot/core/meta_tasks_kine_relative.py
+++ b/src/dynamic_graph/sot/core/meta_tasks_kine_relative.py
@@ -2,10 +2,7 @@ from dynamic_graph import plug
 from dynamic_graph.sot.core import Flags
 from dynamic_graph.sot.core.feature_point6d_relative import FeaturePoint6dRelative
 from dynamic_graph.sot.core.matrix_util import matrixToTuple
-from dynamic_graph.sot.core.meta_task_6d import (
-    MetaTask6d,
-    toFlags,
-)  # noqa kept for backward compatibility
+from dynamic_graph.sot.core.meta_task_6d import MetaTask6d, toFlags  # noqa
 from dynamic_graph.sot.core.meta_tasks import generic6dReference, setGain
 from dynamic_graph.sot.core.op_point_modifier import OpPointModifier
 
diff --git a/src/dynamic_graph/sot/core/utils/attime.py b/src/dynamic_graph/sot/core/utils/attime.py
index 7b7d84db5fe04f9d6f09d9263b286ecb9edaeb00..3ac1548800322634adfed780264bc365a217e982 100644
--- a/src/dynamic_graph/sot/core/utils/attime.py
+++ b/src/dynamic_graph/sot/core/utils/attime.py
@@ -139,5 +139,10 @@ class Calendar:
 
 attime = Calendar()
 
-sigset = lambda s, v: s.__class__.value.__set__(s, v)
-refset = lambda mt, v: mt.__class__.ref.__set__(mt, v)
+
+def sigset(s, v):
+    return s.__class__.value.__set__(s, v)
+
+
+def refset(mt, v):
+    return mt.__class__.ref.__set__(mt, v)