diff --git a/script/users/TUM_PhD.py b/script/users/TUM_PhD.py
index 11d3aa81..cc5cc1b2 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=[]):
+class SpectrumReader(ReadonlyRegisterBase, ReadonlyRegisterArray):
     def initialize(self):
         #super(SpectrumReader, self).initialize()
         self.scan_index = -1
@@ -46,7 +46,7 @@ class SpectrumReader(ReadonlyRegisterBase, ReadonlyRegisterArray,sample_pos=[]):
         create_dataset(self.step_time_dataset_name, 'd')
         create_dataset(self.iterations_dataset_name, 'd')
         
-    def setup(self):
+    def setup(self,sample_pos=[]):
         if self.scan_index != get_exec_pars().index:
             self.scan_index = get_exec_pars().index
             self.create_datasets()