diff --git a/lasagna/plugins/registration_plugins/elastix_plugin.py b/lasagna/plugins/registration_plugins/elastix_plugin.py
index 25d8f15..1ba95df 100644
--- a/lasagna/plugins/registration_plugins/elastix_plugin.py
+++ b/lasagna/plugins/registration_plugins/elastix_plugin.py
@@ -307,7 +307,7 @@ def loadParamFile_slot(self, selectedParamFiles=False):
         3. Create an editable copy in a tempoary location
         """
         if not selectedParamFiles:
-            selectedParamFiles = QtGui.QFileDialog.getOpenFileNames(self, "Select parameter file", "Text files (*.txt *.TXT *.ini *.INI)")
+            selectedParamFiles, filter_used = QtGui.QFileDialog.getOpenFileNames(self, "Select parameter file", "Text files (*.txt *.TXT *.ini *.INI)")
 
         # Add to list
         for path_to_param_file in selectedParamFiles: