diff --git a/examples/read_hessio_single_tel.py b/examples/read_hessio_single_tel.py
index ddcaf64d7f9..0259bb7f746 100644
--- a/examples/read_hessio_single_tel.py
+++ b/examples/read_hessio_single_tel.py
@@ -40,8 +40,7 @@ def apply_mc_calibration(adcs, tel_id):
     apply basic calibration
     """
     peds, gains = get_mc_calibration_coeffs(tel_id)
-    return adcs
-#    return (adcs - peds) * gains     => DISABLED!! DOES NOT WORK
+    return (adcs - peds) * gains 
 
 
 if __name__ == '__main__':