diff --git a/unitTesting/python/tools.py b/unitTesting/python/tools.py
index e7d795def65f29e9fe08bccb1c616a4e9aa4d2af..0bfa24337b6500e71bdfdd666fdf31d38608d141 100755
--- a/unitTesting/python/tools.py
+++ b/unitTesting/python/tools.py
@@ -120,7 +120,7 @@ def reach(robot, op, tx, ty, tz):
     sdes[2][3] += tz
     robot.features[op].reference.value = toTuple(sdes)
     # Select translation only.
-    robot.features[op].feature.signal('selec').value = '000111'
+    robot.features[op]._feature.signal('selec').value = '000111'
     robot.tasks[op].signal('controlGain').value = 1.
 
 def sqrDist(value, expectedValue):