diff --git a/script/test/DemoCscanPseudo4.py b/script/test/DemoCscanPseudo4.py
index 2d36a17c..70b4b4ca 100644
--- a/script/test/DemoCscanPseudo4.py
+++ b/script/test/DemoCscanPseudo4.py
@@ -14,12 +14,14 @@ class PseudoMotor(PositionerBase, Speedable):
         
     def doWrite(self, val):
         self.setp = val
+        self.settime = time.time()
 
     def doReadReadback(self):
          offset = self.setp - self.rbck
          d = (self.speed * (time.time() - self.settime))
          d = min(d, abs(offset))         
          self.rbck = self.rbck + d if offset>0 else self.rbck -d
+         self.settime = time.time()
          return self.rbck
 
     def getSpeed(self):