diff --git a/script/users/TUM_PhD.py b/script/users/TUM_PhD.py
index ab44d54c..11d3aa81 100644
--- a/script/users/TUM_PhD.py
+++ b/script/users/TUM_PhD.py
@@ -24,7 +24,7 @@ CLOSE_SHUTTER_AT_END = True
 
 Scienta.setAcquisitionMode(ch.psi.pshell.epics.Scienta.AcquisitionMode.Swept)
 
-class SpectrumReader(ReadonlyRegisterBase, ReadonlyRegisterArray,sample_pos=[0,0,0,0]):
+class SpectrumReader(ReadonlyRegisterBase, ReadonlyRegisterArray,sample_pos=[]):
     def initialize(self):
         #super(SpectrumReader, self).initialize()
         self.scan_index = -1