diff --git a/Code/Mantid/Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/InelasticIndirectReduction.py b/Code/Mantid/Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/InelasticIndirectReduction.py
index 059a46744d5c..8435a34606a9 100644
--- a/Code/Mantid/Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/InelasticIndirectReduction.py
+++ b/Code/Mantid/Framework/PythonInterface/plugins/algorithms/WorkflowAlgorithms/InelasticIndirectReduction.py
@@ -24,7 +24,7 @@ def PyInit(self):
         self.declareProperty(name='LoadLogs', defaultValue=False, doc='Load sample logs from input files')
 
         self.declareProperty(name='Instrument', defaultValue='', doc='Instrument used during run',
-                             validator=StringListValidator(['IRIS', 'OSIRIS', 'TOSCA', 'BASIS', 'VISION']))
+                             validator=StringListValidator(['IRIS', 'OSIRIS', 'TOSCA', 'TFXA', 'BASIS', 'VISION']))
         self.declareProperty(name='Analyser', defaultValue='', doc='Analyser used during run',
                              validator=StringListValidator(['graphite', 'mica', 'fmica', 'silicon']))
         self.declareProperty(name='Reflection', defaultValue='', doc='Reflection used during run',