diff --git a/responsum/response.py b/responsum/response.py
index 99d3eba..41cd928 100644
--- a/responsum/response.py
+++ b/responsum/response.py
@@ -313,7 +313,7 @@ def to_fits(self, filename, telescope_name, instrument_name, overwrite=False):
             instrument_name,
         )
 
-        fits_file.writeto(filename, clobber=overwrite)
+        fits_file.writeto(filename, overwrite=overwrite)
 
     @classmethod
     def create_dummy_response(cls, ebounds, monte_carlo_energies):