diff --git a/script/daq/PumpProbeXES_DelayScan.py b/script/daq/PumpProbeXES_DelayScan.py
index 18080b8..d0e33f7 100644
--- a/script/daq/PumpProbeXES_DelayScan.py
+++ b/script/daq/PumpProbeXES_DelayScan.py
@@ -105,6 +105,7 @@ def before_sample():
 
 class PseudoPositioner(Writable):
     def write(self,pos):
+        global DelayOn
         DelayOn=pos
     
 dl=PseudoPositioner()