diff --git a/magicctapipe/io/containers.py b/magicctapipe/io/containers.py
index 7cc2c5668..0f909f943 100644
--- a/magicctapipe/io/containers.py
+++ b/magicctapipe/io/containers.py
@@ -26,7 +26,7 @@ class BaseEventInfoContainer(Container):
     pointing_az = Field(DEFAULT_RAD, "Azimuth of the pointing direction", unit="rad")
     n_pixels = Field(DEFAULT_VALUE, "Number of pixels after the image cleaning")
     n_islands = Field(DEFAULT_VALUE, "Number of islands after the image cleaning")
-    tels_with_trigger = Field(None, "Boolean np array (True = telescope triggered by event)")
+    tels_with_trigger = Field(None, "Integer indicating the combination of telescopes that triggered")
 
 
 class RealEventInfoContainer(BaseEventInfoContainer):
diff --git a/magicctapipe/scripts/lst1_magic/magic_calib_to_dl1.py b/magicctapipe/scripts/lst1_magic/magic_calib_to_dl1.py
index 9ff7a9a5e..a9022aeed 100644
--- a/magicctapipe/scripts/lst1_magic/magic_calib_to_dl1.py
+++ b/magicctapipe/scripts/lst1_magic/magic_calib_to_dl1.py
@@ -58,6 +58,7 @@
 from ctapipe_io_magic import MAGICEventSource
 from magicctapipe.image import MAGICClean
 from magicctapipe.io import RealEventInfoContainer, SimEventInfoContainer, format_object
+from magicctapipe.io.io import TEL_COMBINATIONS
 from magicctapipe.utils import calculate_disp, calculate_impact
 
 __all__ = ["magic_calib_to_dl1"]
@@ -337,17 +338,15 @@ def magic_calib_to_dl1(input_file, output_dir, config, process_run=False):
                 event_info.tel_id = 3  # MAGIC-II
 
             if event.trigger.tels_with_trigger == [1, 2]:
-                tels_with_trigger_magic_lst = [2, 3]
+                tels_with_trigger_magic_lst = list(TEL_COMBINATIONS.values()).index([2, 3]) # M1+M2
             elif event.trigger.tels_with_trigger == [2, 3]:
-                tels_with_trigger_magic_lst = [1, 3]
+                tels_with_trigger_magic_lst = list(TEL_COMBINATIONS.values()).index([1, 3]) # M2+LST
             elif event.trigger.tels_with_trigger == [1, 3]:
-                tels_with_trigger_magic_lst = [1, 2]
+                tels_with_trigger_magic_lst = list(TEL_COMBINATIONS.values()).index([1, 2]) # M1+LST
             elif event.trigger.tels_with_trigger == [1, 2, 3]:
-                tels_with_trigger_magic_lst = [1, 2, 3]
+                tels_with_trigger_magic_lst = list(TEL_COMBINATIONS.values()).index([1, 2, 3]) # M1+M2+LST
 
-            tels_with_trigger_mask = subarray_magic.tel_ids_to_mask(tels_with_trigger_magic_lst)
-
-            event_info.tels_with_trigger = tels_with_trigger_mask
+            event_info.tels_with_trigger = tels_with_trigger_magic_lst
 
             # Save the parameters to the output file
             writer.write(