diff --git a/tboxVtk/lineExtractor.py b/tboxVtk/lineExtractor.py
index df305b5c77c48fbff39f830080ebf1ea4a2fd569..3eb9320db4db2c214bdf68332f1bb44a823ea062 100644
--- a/tboxVtk/lineExtractor.py
+++ b/tboxVtk/lineExtractor.py
@@ -55,7 +55,8 @@ class LineExtractor:
 
         # create a threshold containing the physical group (tag) to cut
         thresh = vtk.vtkThreshold()
-        thresh.ThresholdBetween(tag,tag)
+        thresh.SetLowerThreshold(tag)
+        thresh.SetUpperThreshold(tag)
         thresh.SetInputConnection(self.grid)
         thresh.SetInputArrayToProcess(0, 0, 0, vtk.vtkDataObject.FIELD_ASSOCIATION_CELLS, tag_name) # "tag" is the default name set in tboxVtk::VtkExport::save
         thresh.Update()