diff --git a/src/dataprovider/conductcalibprovider.py b/src/dataprovider/conductcalibprovider.py
index b6ec1fe9beb20e8e5df724115360b65d7bac39ae..3d90777cbb621d14d2d61245a1a7df1ea4a624e6 100644
--- a/src/dataprovider/conductcalibprovider.py
+++ b/src/dataprovider/conductcalibprovider.py
@@ -24,7 +24,7 @@ class ConductCalibProvider:
     def export_set_as_file(self, filename: str) -> None:
         # Test if filename already has a extension ('.' followed by 3 letters) ; if not: append '.csv'
         if not re.match(".*\.[a-zA-Z]{3}$", filename):
-            filename += '.csv'
+            filename += '.tsv'
 
         # Concatenate the data of all runs of the calibration set in a single pd.Dataframe
         set_df = pd.DataFrame()